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Sail through JEE 2020: Optical instruments (App update required to attempt this test)

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Question 1

The focal lengths of objective lens and eye lens of a Gallelian Telescope are respectively 30 cm and 3.0 cm. Telescope produces virtual, erect image of an object situated far away from it at least distance of distinct vision from the eye lens. In this condition, the Magnifying Power of the Gallelian Telescope should be :

Question 2

A microscope is having objective of focal length 1 cm and eyepiece of focal length 6 cm. If tube length is 30 cm and image is formed at the least distance of distinct vision, what is the magnification produced by the microscope?
Take D = 25 cm

Question 3

In an optical telescope arrangement, shown below, the opaque mask covers the lens completely except for two very small holes, separated by distance d. The screen is kept at the focal plane of the lens, and a collimated monochromatic radiation with wavelength is incident on the mask from left. The angular dependence of the intensity distribution at the screen is given by

Question 4

In a compound microscope, the focal length of the objective lens is 1.2 cm and focal length of the eyepiece is 3.0 cm. When the object is kept at 1.25 cm in front of objective, the final image is formed at infinity. The magnifying power of the compound microscope should be :

Question 5

An observer looks at a distance tree of height 10m with a telescope of magnifying power of 20. To the observer the tree appears:

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Apr 28JEE & BITSAT