Question

A man wants to get a picture of a zebra photographed by a white donkey after fitting a glass with black streaks onto the objective of his camera.
A) The image will look like a white donkey in the photograph.
B) The image will look like a Zebra on the photograph.
C) The image will be more intense compared to the case in which no such glass is used.
D) The image will be less intense compared to the case in which no such glass is used.

Answer 1

-Hint: - Use the Young’s Double Slit Experiment. When the glass with the black streaks is fitted and the white donkey is photographed then the rays of light coming from the white donkey will interfere with the black streaks of the glass.

Complete Step by Step Solution: -
This question uses the Young’s Double Slit Experiment which uses the two coherent sources of light placed at some distance. This experiment consists of two coherent sources of light, optical screen and a screen with two slits.
This experiment is arranged in such a way that the two slits are separated with each other by some distance and an optical screen is placed at some distance apart from both the slits. Then, the source of light separated by some distance from two slits passes through these slits and falls on the screen. After this, if one of the slits in this experiment is open and the other one is closed, then the screen which is opposite to the closed slit is illuminated and the screen opposite to the open screen is closed. In this experiment, we get the bright and dark fringes pattern.
Therefore, according to the question, when the light source from the body of white donkey interferes with the black streaks of the glass then, we will get the image of a zebra with the black streaks on its body.

Hence, option (B) is the correct answer.

Note: - The path difference in Young’s Double Slit Experiment is the meeting of waves at a point on the screen. The path difference makes some fringes of the screen dark at some point and some fringes bright at some point.