Practice Sheets on Light Reflection & Refraction

Light reflection and refraction Worksheet-7

1. An object is placed at a large distance in front of a convex mirror of radius of curvature 40 cm. How far is the image behind the mirror ?

2. An object is placed 15 cm from a convex mirror of radius of curvature 90 cm. Calculate position of the image and its magnification.

3. The image formed by a convex mirror of focal length 30 cm is a quarter of the object. What is the distance of the object from the mirror ?

4. When an object is placed at a distance of 60 cm from a convex spherical mirror, the magnification produced is 1/2. Where should the object be placed to get a magnification of 1/3 ? 

Light reflection and refraction Worksheet-8

1. The refractive index of glycerin is 1.46. What is the speed of light in air if its speed in glycerin  is 2.05 × 10⁸ m/s ?

2. The refractive index of glass is 1.6 and that of diamond is 2.4. Calculate refractive index of diamond with respect to glass.

3. The refractive index of glass is 1.6 and that of diamond is 2.4. What is the refractive index of glass w.r.t. diamond ?

4. A ray of light is traveling from glass to air. The angle of incidence in glass is 35°, and angle of refraction in air is 60°. What is the refractive index of glass w.r.t. air ?

Light reflection and refraction Worksheet-9

1. An object is placed at a distance or 50 cm from a concave lens of focal length 30 cm. Find the nature and position of the image.

2. An object of height 2 cm is placed at a distance of 15 cm in front of a concave lens of power –10 dioptre. Find the size of the image.

3. A thin lens has a focal length of –25 cm. What is the power of the lens ? Is it convex or concave ?

4. The power of lens is 2-5 D. What is its focal length?

5. A convergent lens of power 8 D is combined with a divergent lens of power –10 D. Calculate focal length of the combination.