CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
0
You visited us 0 times! Enjoying our articles? Unlock Full Access!
Question

The radii of curvature of lens are +20cm and +30cm. The material of the lens has refracting index 1.6. find the focal length of the lens (a) if it is placed in air, and (b) if it is placed in water (μ=1.33)

Open in App
Solution

R1=+20cm;R2=+30cm;μ=1.6
a) If placed in air:
1f=(μg1)(1R11R2)=(1.611)(120130)

f=60/6=100cm

b) If placed in water:
1f=(μw1)(1R11R2)=(1.61.331)(120130)

f=300cm

1542058_1287307_ans_65b91776236a4df3aaa975287971cbec.JPG

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Thin Lenses: Point Objects
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon