Class 10 / Science
Class 10 Science Light Reflection and Refraction Worksheet
Practice mirrors, lenses, reflection, refraction, image formation, sign convention, and formula questions.
advanced50 minutesAnswer key included
Learning objective
Practise reflection, refraction, mirror and lens terms, ray diagrams, sign convention, and basic formula-based light numericals.
Questions
- State the laws of reflection.
- Differentiate reflection and refraction.
- Define principal focus of a concave mirror.
- Draw a ray diagram for image formed by a concave mirror when object is beyond C.
- What type of mirror is used as a rear-view mirror and why?
- Define refractive index.
- Write the mirror formula.
- Write the lens formula.
- What is magnification?
- A lens has focal length 20 cm. Find its power in dioptres.
Answer key
Show suggested answers
- The incident ray, reflected ray, and normal lie in the same plane. The angle of incidence is equal to the angle of reflection.
- Reflection is the bouncing back of light into the same medium. Refraction is the bending of light when it passes from one medium to another.
- The principal focus of a concave mirror is the point on the principal axis where rays parallel to the axis meet after reflection.
- For an object beyond C, the image is formed between F and C. It is real, inverted, and diminished. The ray diagram should show one ray parallel to the principal axis reflecting through F and another ray passing through C and returning along the same path.
- A convex mirror is used as a rear-view mirror because it forms an erect, diminished image and gives a wider field of view.
- Refractive index is the ratio of the speed of light in vacuum or air to the speed of light in the given medium.
- Mirror formula: 1/f = 1/v + 1/u.
- Lens formula: 1/f = 1/v - 1/u.
- Magnification is the ratio of image height to object height. It also indicates whether the image is enlarged, diminished, erect, or inverted.
- Focal length = 20 cm = 0.20 m. Power = 1/f = 1/0.20 = 5 D.
How to use this worksheet
Students can solve the questions independently first, then review errors with a parent or teacher. Teachers can use it as a short class activity, homework sheet, or revision check.
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