Two lenses of power +15 D and -5 D are in contact with each other forming a combination of lenses. What is the focal length of this combination?

10 cm

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

20 cm

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

5 cm

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

15 cm

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

Open in App

Solution

The correct option is A 10 cm

Suggest Corrections

Similar questions

Q. Two lenses of powers

+ 15 D

and

- 5 D

are in contact with each other. What is the focal length of combination?

Q. Two lenses of power

- 15 D

and

+ 5 D

are in contact with each other. The focal length of the combination is

Q. Two lenses of power -15 D and + 5D are in contact with each other. The focal length combination is:

A convex lens of power 5 D and a concave lens of power 7.5 D are placed in contact with each other. What is the :
(a) power of this combination of lenses?
(b) focal length of this combination of lenses?

A convex lens of power 5 D and a concave lens of power 7.5 D are placed in contact with each other. What is the:
(a) Power of this combination of lenses?
(b) Focal length of this combination of lenses ?

Join BYJU'S Learning Program