A double convex lens of equal radii of curvature'R'and refractive index of material is 1.5. What is focal length?
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12th
Physics
Ray Optics and Optical Instruments
Combination of Mirror and Lenses
A double convex lens has tw...
PHYSICS
A double convex lens has two surface of equal radii
′
R
′
and refractive index n=1.5. Find the focal length
′
f
′
December 20, 2019
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Naveen Ravi
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ANSWER
Given
Radius of curvature =R
focal length =f
Refractive index, μ=1.5
From lens maker's formula
f
1
=(μ−1)[
R
1
1
−
R
2
1
]
f
1
=(1.5−1)[
R
1
+
R
1
]
=0.5×
R
2
f
1
=
R
1
f=R
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