Question

P-
P- 20
20 - -20cm
20
2x1.5
3
20
IR 1
=f=2lu-1) 2(1.5 - 1)
20
Baki
BEGINNER'S BOX-7
In the displacement method the distance between the object and the screen is 70 cm and the focal length of the
lens is 16 cm, find the separation between the magnified and diminished image position of the lens.
An achromatic doublet of focal length 90 cm is to be made of two lens. The material of one of the lenses
has 1.5 times the dispersive power of the other. The doublet is converging type. Find the focal length
of each lens.
The dispersive power of material of a lens of focal length 20 cm is 0.08. Find the longitudinal chromatic
aberration of the lens ?
The dispersive powers of the materials of the two lenses are in the ratio of 4/3. If the focal length of this
achromatic combination is 60 cm, find the focal length of the lenses
od the focal length of the lenses. los tr boi oub
stic aberration in case of a lens which focusses violet ray 20.1 cm and red ray 20
What is the axial chromatic aberration in case of a lens which focusses
away from it.
"RISM
A prism is a portion of a homogeneous, transparent medium (such as
inclined at an angle. These surfaces are called the 'refracting
(such as glass) enclosed by two plane surfaces
a ting angle or the angle of prima
faces are called the refracting surfaces and the anale!
La​

Answer 1

Answer:

- 20

20 - -20cm

20

2x1.5

3

20

IR 1

=f=2lu-1) 2(1.5 - 1)

20

Baki

BEGINNER'S BOX-7

In the displacement method the distance between the object and the screen is 70 cm and the focal length of the

lens is 16 cm, find the separation between the magnified and diminished image position of the lens.

An achromatic doublet of focal length 90 cm is to be made of two lens. The material of one of the lenses

has 1.5 times the dispersive power of the other. The doublet is converging type. Find the focal length

of each lens.

The dispersive power of material of a lens of focal length 20 cm is 0.08. Find the longitudinal chromatic

aberration of the lens ?

The dispersive powers of the materials of the two lenses are in the ratio of 4/3. If the focal length of this

achromatic combination is 60 cm, find the focal length of the lenses

od the focal length of the lenses. los tr boi oub

stic aberration in case of a lens which focusses violet ray 20.1 cm and red ray 20

What is the axial chromatic aberration in case of a lens which focusses

away from it.

"RISM

A prism is a portion of a homogeneous, transparent medium (such as

inclined at an angle. These surfaces are called the 'refracting

(such as glass) enclosed by two plane surfaces

a ting angle or the angle of prima

faces are called the refracting surfaces and the