Question

A student was asked by his teacher to find the image distance for various object distance in case of a given convex lens. He performed the experiment with all precautions and noted down his observations in the following table:
S. No.
Object distance
(cm)
Image distance
(cm)
1
60
15
2
48
16
3
36
21
4
24
24
5
18
36
6
16
48
After checking the observations table the teacher pointed out that there is a mistake in recording the image distance in one of the observations. Find the serial number of the observations having faulty image distance.
(A) 2
(B) 3
(C) 5
(D) 6

Answer 1

Answer:

B.) 3

Explanation:

By using Lens formula:

$\frac{1}{v} - \frac{1}{u} = \frac{1}{f }$

Further , Explanation is given in that photo