A car is fitted with a convex mirror of focal length 20 cm. Another car is 6 m away from the first car.
a) Find the position of the second car as seen in the mirror of the first
b) What is the size of the image if the second car is 2 m broad and 1.6 m high?
Focal length = 20 cm (convex mirror)
Object distance = -6m
 = -600 cm
Image distance v =?
Calculation for position of image using mirror equation

Explain with diagrams how refraction of incident light takes place from
a) rarer to denser medium
b) denser to rarer medium
c) normal to the surface separating the two media.

Draw a ray diagram to show the formation of image by a concave mirror for an object placed between its pole and Principal focus and state three characteristics of the image.

An object of height 2 cm is placed at a distance 20 cm in front of a concave mirror of focal length 12 cm. Find the position, size and nature of the image.

Light enters from air into a glass plate having refractive index 1.5. What is the speed of light in glass? (Speed of light in vacuum is 3 × 10⁸ ms^-1).