Question

for convex lens which surface is polished​

Answer 1

Explanation:

When an object is placed in front of such a lens, the rays first of all refracted from the convex surface, then refract from the polished plane surface and again refracts from convex surface. If f

1

and f

m

be the focal lengths of lens(convex surface) and mirror (plane polished surface) respectively, then effective focal length F is given by

F

1

=

f

1

1

+

f

m

1

+

f

1

1

=

f

1

2

+

f

m

1

=

f

1

2

(∵f

m

=

2

R

=∞)

f

1

1

=(μ−1)(

R

1

)

∴

F

1

=

R

2(μ−1)

or F=

2(μ−1)

R

or R=2F=

(μ−1)

R

.

Answer 2

Answer:

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