Question

A ray of light passing through a semicircle block from air is shown below. Consider the given figure and select the correct option which correctly identifies the true (T) and false (F)?
(i) There is no change in the direction of ray at $P$ because light ray incident on semicircular block at ${90}^{\circ }$.
(ii) As light rays enters the semicircular block, its frequency remains the same.
(iii) Wavelength of light rays as it enters the block decreases.
(iv) Speed of light as it enters the block increases.

• A. T F F T
• B. F T T F
• C. T T T F
• D. F F F T

Answer 1

The correct option is C T T T F

The ray of light is normal to the surface of the semicircular block.

The frequency of the light ray remains same.

Wavelength of light rays as it enters the block decreases.

Speed of light as it enters the block decreases because it is entering from rarer to denser medium.