Question

When travelling obliquely from one optical medium to another optical medium, the direction of light rays in the second medium _____________.

• A. remains same
• B. changes
• C. may change or remain same
• D. reflects back

Answer 1

The correct option is B

changes

When a light ray travels from one optical medium to another optical medium, then it's velocity changes. If it is incident in a direction oblique to the surface, it bends and its path changes. This phenomenon is known as refraction.
In fact, the path taken by light is such that it can be traversed in the least time. This is why, the bottom of a tank or a pond containing water appears to be raised.