wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

An image (I) is formed in front of a concave lens of power 6.66 D as shown in the figure. Where would the object be?

[1 mark]

A
At F2
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
Between F1 and optical centre C
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
Beyond F2
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
At infinity
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

The correct option is D At infinity
Given,
Power of lens (P) = 6.66 D

As it is a concave lens, according to sign convention, the power will be negative.
∴ P = -6.66 D
Power of lens P = 1focal length (f) in metres

∴ Focal length of the lens (f) in metres = 1Power of lens (P)

f = 16.66 D

∴ f = -0.15 m = -15 cm

So, the focus is at a distance of -15 cm from the lens.

For a concave lens, the image forms on the same side of the lens as the object. From the figure, as we can see, the image is formed at the focus. So, the object must be at infinity.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Image formation by Concave Lens Tackle
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon