Mr. X is performing an experiment on refraction with a glass slab. He places two pins P1 and P2 at an angle of 45o and then on the other side he places pins P3 and P4. (i) Show the correct ray diagram (ii) What is the perpendicular distance between the incident ray and the emergent ray called? (iii) If he places a red filter in the path of light, what will be the colour of the ray of light? (iv) If the emergent ray is allowed to fall normally on a plane mirror, what will be the effect on the path of light?
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Explanation:
The pins must not be too close to each other, otherwise it would be hard to align the light passing through both of them when seen from the other side of the slab. Hence III is rejected.
The incident ray of light must not be normal to the glass slab surface, otherwise it would directly go straight ahead giving no information about the refractive index. Hence I is rejected.
Also the angle of incidence must be optimum for observing the shifted path of light after emergence from the other side of slab. A large angle of incidence can give poor results. Hence II is rejected.
Correct answer is option D.
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