MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Chromatic Aberrations

A convex lens...

Question

A convex lens of focal length 80 cm and concave lens of focal length 50 cm are combined together. What will be their resultant power?

A

0.65 D

No worries! We‘ve got your back. Try BYJU‘S free classes today!

B

-0.65 D

No worries! We‘ve got your back. Try BYJU‘S free classes today!

C

0.75 D

No worries! We‘ve got your back. Try BYJU‘S free classes today!

D

-0.75 D

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is C -0.75 D
$P_{1} = 1.25 D a n d P_{2} = - 2 D P_{n e t} = P_{1} + P_{2} = - 0.75 D$

Suggest Corrections

thumbs-up

3

Similar questions

Q. A convex lens of focal length 50 cm, a concave lens of focal length 50 cm and another concave lens of focal lens 20 cm are placed in contact. The power of this combination in dioptres will be:

Q. A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length 40 cm. Calculate the :
(a) Power of each lens
(b) Power of resulted lens
(c) Nature of resulted lens
(d) Focal length of the resulted lens
[5 MARKS]

Q. A combination of lenses is prepared by keeping a, think convex lens of 40 cm focal length and a thin concave lens of 40 cm focal length and a think concave lens of 15 cm focal length in contact.
So, the power of combination = ................D.

Q. An optician prescribes spectacles to a patient with a combination of a convex lens of focal length 40 cm and a concave lens of focal length 25 cm. What will be the power of spectacles?

Q. A convex lens of focal length 10 cm is placed in contact with a concave lens of focal length 20 cm. The focal length of this combination of lenses will be:
(a) +10 cm
(b) +20 cm
(c) −10 cm
(d) −20 cm

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Defects in Images

PHYSICS

Watch in App

explore_more_icon

Explore more

Chromatic Aberrations

Standard XII Physics

Join BYJU'S Learning Program

CrossIcon