The image below shows the refraction of light in three transparent rectangular blocks, X, Y and Z, made of different materials when they are placed in air. The angle of incidence is different in each case but the angle of refraction is the same in all three blocks.

Compare the speed of light in the three blocks. Justify your answer.

Four students A, B, C and D performed an experiment to determine the focal length of a concave mirror by using a lighted candle kept at a considerable distance as the object. They represented the position of image by drawing the following diagrams:

Which diagram describes the correct position of the image of the candle?

We might have observed that convex mirrors are used in vehicles as rearview mirrors. Convex mirrors are preferred as rearview mirrors because they always produce erect image and has large field of view compared to plane mirrors. We might have also observed the note written on rearview mirrors saying that objects appearing in the mirrors are closer than they appear. Let’s understand how far/close they look in a rearview mirror with this case study.

A car is fitted with convex mirror as a rearview mirror of radius of curvature $300 \mathrm{cm}$. If a vehicle behind the car is at $6 \mathrm{m}$ from the mirror and its height is $2 \mathrm{m}$, then the height of the vehicle appear in the mirror is

Four students A, B, C, and D showed the following traces of the path of a ray of light passing through a rectangular glass slab. The trace most likely to be correct is that of student -