Optics MCQ with Answers

Optics MCQ with Answers

91) A light source emits visible light of two wavelengths:???= 430 nm and??' = 510 nm. The source is used in a double-slit interference experiment in which L = 1.5 m and d = 0.025 mm. separation distance between the third order bright fringes. is

Answer is:

1.4 cm

Explanation:

use ? = ?D/d

92) In a two-slit interference experiment in which the slits are 0.200 mm apart and the screen is 1.00 m from the slits. The m = 3 bright fringe is 9.49 mm from the central fringe. Wavelength of the light is

Answer is:

633 nm

Explanation:

use ? = ?D/d

93) Two slits are made one millimetre apart and the screen is placed one metre away. Blue green light of wavelength 500 nm. is used . what should the width of each slit be to obtain 10 maxima of the double slit pattern within the central maximum of the single slit pattern

Answer is:

0.2

Explanation:

use ? = ?D/d

94) Assume that light of wavelength 6000?A⁰?is coming from a star. What is the limit of resolution of a telescope whose objective has a diameter of 100 inch?

Answer is:

2.9??10^?7rad

Explanation:

use 1/(/theta)=D/1.22 ?

95) For what distance is ray optics a good approximation when the aperture is 3 mm wide and the wavelength is 500 nm?

Answer is:

18 m

Explanation:

use Z = d²/ ?

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