MyQuestionIcon

1

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

Power of a Lens

Express the p...

Question

Express the power (with sign) of a concave lens of focal length 20 cm.

Open in App

Solution

P=1/F
=1/0.2
=5D

As it is a concave lens so power is negative
so P=-5D

Suggest Corrections

thumbs-up

13

Similar questions

Q. A convex lens of focal length

20 c m

is placed in contact with a concave lens of focal length

10 c m .

calculate power of combination.

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 convex lens of focal length

30 c m

is placed in contact with a concave lens of focal length

20 c m

. What is the power of the combination of lens?

The focal length of a convex lens is 25 cm. Express its power with sign.

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

Lens Formula, Magnification and Power of Lens

PHYSICS

Watch in App

explore_more_icon

Explore more

Power of a Lens

Standard X Physics

Join BYJU'S Learning Program

CrossIcon