JEE PHYSICS MCQ: RAY OPTICS

1 Medium

1 of 1

Application +4 | -1

A 2 meter long scale with least count of

0.2 \, \mathrm{cm}

is used to measure the locations of objects on an optical bench. While measuring the focal length of a convex lens, the object pin and the convex lens are placed at

80 \, \mathrm{cm}

mark and

1 \, \mathrm{m}

mark, respectively. The image of the object pin on the other side of lens coincides with image pin that is kept at

180 \, \mathrm{cm}

mark. The % error in the estimation of focal length is:

View answer and explanation

Correct option: B

1.7

Option B (1.7) is correct because it is calculated by finding the focal length and its uncertainty using the given measurements and then calculating the percentage error.

More Questions from RAY OPTICS

Practice All Chapter MCQs →

In refraction, light waves are bent on passing from one medium to the second medium, because, in the second medium A double convex lens is made of glass which has its refractive index 1,45 for violet rays and 1.50 for red rays. If the focal length for violet ray is

20 \mathrm{~cm}

, the focal length for red ray will be Which light rays undergoes two internal reflection inside a raindrop, which of the rainbow is formed? A piece of plane glass is placed on a word with letters of different colours. The letters which appear minimum raised are A dentist has a small mirror of focal length

16 {~mm}

. He views the cavity in the tooth of a patient by holding the mirror at a distance of

8 {~mm}

from the cavity. The magnification is All of the following statements are correct except