Question
Question: When a pin is moved along the principal axis of a small concave mirror, the image position coincides...
When a pin is moved along the principal axis of a small concave mirror, the image position coincides with the object at a point 0.5 m from the mirror, refer figure. If the mirror is placed at a depth of 0.2 m in a transparent liquid, the same phenomenon occurs when the pin is placed 0.4 m from the mirror. The refractive index of the liquid is –
A
6/5
B
5/4
C
4/3
D
3/2
Answer
3/2
Explanation
Solution
R = 50 cm
dapp. = 30 = m 20
Ž m = 3/2