Light Reflection and Refraction Worksheet with Online Quiz

• Draw a normal before measuring reflection or refraction angles.
• Identify the optical device before choosing a formula.
• Write signed values of u and f before calculating.
• Keep mirror magnification −v/u separate from lens magnification v/u.
• Use the sign of m for orientation and its magnitude for size.
• Convert focal length to metres before calculating power in dioptres.
• Distinguish actual rays from backward extensions.
• Check numerical answers against the expected ray diagram.

• Ask students to predict the image before moving the object slider.
• Compare object positions just inside and outside the focus.
• Use the reflection lab to distinguish angles from the normal and surface.
• Let students explain why a screen cannot catch a virtual image at its apparent position.
• Discuss model assumptions, alignment and measurement uncertainty.

This Light Reflection and Refraction Class 10 worksheet page combines written practice, a timed online quiz and interactive ray-diagram activities. Revise spherical mirrors, thin lenses, refractive index, glass slabs, sign conventions and lens power. Use the existing worksheet download for written answers, then compare your reasoning with the models above.

Light Reflection and Refraction Important Questions

Practise principal-ray constructions, image-position tables, real and virtual images, mirror and lens numericals, magnification, Snell's law, refractive index, slab displacement and power conversions. The explanations below support extra questions with answers, case-based problems and assertion–reason practice.

Laws of Reflection and the Normal

The angle of reflection equals the angle of incidence. Both angles are measured from the normal at the point where the ray meets the surface. The incident ray, reflected ray and normal lie in one plane. A rough surface can scatter rays in many directions while each small surface region obeys the reflection law.

Concave and Convex Mirror Ray Diagrams

A concave mirror converges paraxial parallel rays toward a real focus. A convex mirror makes reflected rays diverge as though they came from a virtual focus behind the mirror. A ray directed through a spherical mirror's centre of curvature follows the local normal and retraces its path.

A convex mirror gives a virtual, upright and diminished image for a finite real object in front. Its broad field of view makes it useful as a vehicle rear-view mirror.

Convex and Concave Lens Image Formation

An ordinary concave lens in air gives a virtual, upright and diminished image for a real object. A thin-lens ray through the optical centre is approximately undeviated. The optical bench uses paraxial mirror and thin-lens models rather than exact large-aperture ray tracing.

New Cartesian Sign Convention Class 10

In these diagrams the initial incident light travels left to right. Distances are measured from the mirror pole P or lens optical centre O. Rightward distances are positive and leftward distances negative. A real object on the left has u < 0. Heights above the axis are positive and below it negative.

Light Class 10 Formula Sheet

The letter v denotes image distance in mirror and lens equations but light speed in the index formula. Its meaning and units come from the context.

Mirror Formula Numerical with Solution

Lens Formula Numerical with Solution

Power of Lens Questions with Solutions

Dioptre is the inverse metre. Power is not measured in watts, and a negative sign does not mean a physically negative lens thickness.

Refraction Snell's Law and Refractive Index

For transmitted light at a stationary boundary, frequency remains unchanged while speed and wavelength can change. At oblique incidence, moving into a higher-index medium bends the ray toward the normal; moving into a lower-index medium below the critical angle bends it away. At normal incidence, direction stays unchanged. Optical density should not be confused with mass density.

The refraction explorer treats refractive indices as fixed teaching values. If a higher-to-lower-index setting exceeds the critical angle, it displays total internal reflection rather than inventing a refracted angle. That behaviour is an extension beyond the main Class 10 tasks.

Glass Slab Ray Diagram and Lateral Displacement

For parallel faces with the same surrounding medium on both sides, the emergent ray is parallel to the incident ray. An oblique path is generally shifted sideways. At normal incidence the lateral displacement is zero. Increasing thickness at fixed incidence and indices increases the displacement. A parallel emergent ray does not mean that no refraction happened inside the slab.

Light Reflection and Refraction Extra Questions with Answers

1. Can a virtual image be caught directly on a screen at its apparent location? No. Actual rays do not converge there.
2. Does negative magnification mean a smaller image? No. It means inversion in these cases; use |m| to compare size.
3. Why is a convex mirror useful for rear viewing? It provides a broad field of view with upright diminished images.
4. What happens at the focus of a convex lens? The ideal output rays are parallel and the image distance is not finite.
5. Why might a ray sketch and calculation disagree? Recheck the device, focal position, signs, units and actual versus extended rays.

Current Syllabus and Sample Paper Update

The CBSE Science syllabus for 2026–27 lists image formation, mirror and lens formulas, magnification, refraction, refractive index and lens power; formula derivations are not required in that listing. The official sample paper includes focal-length estimation, Snell's law, relative refractive index and a lens numerical using magnification. These are verified practice themes rather than predictions or repeated-board-question claims.

Reference NCERT Light Reflection and Refraction. Reviewed on 22 October 2026. Interactive questions here are original practice material.

Reflection returns light into the incident medium. Refraction concerns transmission across a boundary with a change in speed; the direction can change at oblique incidence.

The incident and reflected angles are equal when measured from the normal. The incident ray, normal and reflected ray lie in one plane.

A concave mirror can converge paraxial parallel rays and can form real or virtual images depending on object position. A convex mirror gives an upright diminished virtual image for a real object.

Using signed Cartesian quantities, 1/f = 1/v + 1/u. Mirror magnification is m = −v/u.

For the thin-lens model, 1/f = 1/v − 1/u. Lens magnification is m = v/u.

Initial incident light travels left to right, and the real object is to the left of the pole or optical centre. Leftward distances are negative in this setup.

It indicates inversion in the stated real-object mirror and lens cases. Relative size comes from the magnitude of m rather than its sign.

Absolute refractive index is the ratio of light speed in vacuum to its speed in the medium. Relative index n₂/n₁ equals sin i/sin r when Snell’s law applies.

For parallel faces and the same external medium, the two refractions restore the original direction while an oblique path can be laterally displaced.

Use P = 1/f with focal length in metres to get dioptres. A converging lens in air has positive power and a diverging lens negative power.

Yes. For a real object between the optical centre and near focus, the image is virtual, upright and magnified on the object side.

Practise ray diagrams, image tables, signs, mirror and lens numericals, magnification, refractive index, Snell’s law, slab paths and power conversion. Use actual official papers for genuine previous-year questions.