Practice Sheets on Light Reflection & Refraction

Light reflection and refraction Worksheet-19

1. Show the formation of image of the object AB with the help of suitable rays.

2. Show the formation of image with the help of suitable rays.

3. Why does a ray of light bend when it travels from one medium to another?

4. Complete the figure for the path of ray of light beyond the lens.

Light reflection and refraction Worksheet-20

1. With respect to air, the refractive index of ice is 1.31 and that of rock salt is 1.54. Calculate the refractive index of rock salt w.r.t ice.

2. Draw a labelled ray diagram to locate the image of an object formed by a convex lens of focal length 20 cm when the object is placed 30 cm away from the lens.  

3. Explain with the help of a diagram, why a pencil partly immersed in water appears to be bent at the water surface.

4. Draw the ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed (i) at 2F₁ (ii) between F₁ and optical centre O of the lens.

Light reflection and refraction Worksheet-21

1. A convex lens has focal length of 30 cm. Calculate at what distance should the object be placed from the lens so that it forms an image at 60 cm on the other side of the lens ? Find the magnification produced by the lens in this case.

2. Find the position, nature and size of the image of an object 3 cm high placed at a distance of 9 cm from a concave mirror of focal length 18 cm.

3. An object 4 cm high is placed 40.0 cm in front of a concave mirror of focal length 20 cm. Find the distance from the mirror, at which a screen be placed in order to obtain a sharp image. Also, find the size and nature of the image formed.

4. An object is placed at a distance of 12 cm in front of a concave mirror. It forms a real image four times larger than the object. Calculate the distance of the image from the mirror.