Question

A beam of light composed of red and green ray is incident obliquely at a point on the face of rectangulal glass slab.

Answer 1

1) A beam of light composed of red and green ray is incident obliquely at a point on the face of rectangular glass slab. When coming out on the opposite parallel face, the red and green ray emerge from                    [CBSE PMT 2004]

A)            Two points propagating in two different directions

B)            Two points propagating in two parallel directions

C)            One point propagating in two different directions

D)            One point propagating in the same directions

 

Correct Answer: B

Solution :

          Angle of refraction will be different, due to which red and green emerge from different points and will be parallel.

Answer 2

Complete Question:

A beam is composed of red and green rays. It is incident obliquely at a point on the face of a rectangular glass slab. When coming out on the opposite parallel face, the red and green rays emerge from :

A) Two points propagating in two different directions

B) Two points propagating in two parallel directions

C) One point propagating in two different directions

D)  One point propagating in the same directions

Answer:

The correct option is B) Two points propagating in two parallel directions.

Explanation:

• When the beam of light falls on the glass slab. They will suffer refraction or bending of light as it travels from one medium to another.
• This bending depends on the wavelengths. Since blue and red lights have different wavelengths, they will be separated.

• We are aware that different colors move at different speeds in every medium, with the exception of vacuum and air.
• As a result, the refraction of the colors red and green occurs at various angles.
• They, therefore, appear at two distinct spots and move in two different parallel directions after emerging from the glass slab through opposing parallel faces.

• Thus, When coming out on the opposite parallel face, the red and green rays emerge from Two points propagating in two parallel directions.

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