Home
Class 12
PHYSICS
A microscope is focussed on a mark on a ...

A microscope is focussed on a mark on a piece of paper and then a slab of glass of thickness 3 cm and refractive index `1.5` is placed over the mark. How should the microscope be moved to get the mark in foucs again ?

A

1 cm upward

B

4.5 cm downward

C

1 cm downward

D

2 cm upward

Text Solution

Verified by Experts

The correct Answer is:
A
Shifting in microscope=upward shifting in mark
`=t(1-1/mu)=3(1-(1)/1.5)=1cm`
Promotional Banner

Similar Questions

Explore conceptually related problems

A microscope is focused on a mark on a piece of paper and then a slab of glass of thickness 3cm and refractive index 1.5 is placed over the mark. How should the microscope be moved to get the mark in focus again ?

A microscope is focused on a mark on a piece of paper and then a slab of glass of thickness 3cm and refractive index 1.5 is placed over the mark. How should the microscope be moved to get the mark in focus again ?

A small ink dot on a paper is viewed through a glass slab of thickness 10cm and refractive index 1.5. By what distance would the dot appear to be raised?

An object is placed 21 cm in fron of a concave mirror of radius of curvature 20 cm.A glass slab of thicknes 3 cm and refractive index 1.5 is palced close to the mirror in the space between the object and the mirror. Find the position of the final image fromed. The distance of the nearer surface of the slab from the mirror is 10 cm.

A microscope is focussed on an ink mark on the top of a table. If we place a glass slab of 3 cm thick on it, how should the microscope be moved to focus the ink spot again? The refractive index of glass is 1.5

A microscope is focussed on a point object, and then its objective is raised through a height of 2cm when a glass slab of refractive index 1.5 is placed over this point object such that it is focussed again. The thickness of the glass slab is

An object P is focussed by a microscope M. A glass slab of thickness 2'1 cm is introduced between P and M. If the refractive index of the slab is P5, by what distance should the microscope be shifted to focus the object again ?

An object is placed 21 cm in front of a concave mirror of radius of curvature 10cm. A glass slabe of thickness 3cm and refractive index 1.5 is then placed close to the irror in the space between the object and the mirror. The distance of the near surface of the slabe from the mirror is 1cm. The final image from the mirror will be formed at

A point object is placed at the center of a glass sphere of radius 6cm and refractive index 1.5. The distance of virtual image from the surface is

A glass slab of thickness 3cm and refractive index 1.5 is placed in front of a concave mirror of focal length 20cm. Where should a point object be placed if it is to image on to itself?