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

# What will be the diameter of the image of the moon formed by a spherical concave mirror of focal length 7.6 m?The diameter of the moon is 3450 km and the distance between the earth and the moon is 3.8×105 km.

A

0.49 mm

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

0.59 mm

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

0.69 mm

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

0.79 mm

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

## The correct option is C 0.69 mm u=−3.8×105km using mirror formula 1v+1v=1f u=∞ so neglecting 1u so 1v=1f⇒V=−7.6cm m=−vu=Height of imageHeight of object⇒−(−7.6×10−2)−3.8×103=H13450×103⇒−(7.6×10−2×3450×103×10−3)3.8H1⇒2×3450×10−7⇒69×10−5m⇒69×10−3cm⇒69×10−2cm⇒0.69mm

Suggest Corrections
0
Join BYJU'S Learning Program
Related Videos
Image Formation by Spherical Mirrors - concept
PHYSICS
Watch in App
Join BYJU'S Learning Program