The radii of curvature of a lens are + 2...

The radii of curvature of a lens are + 20 cm and + 30 cm. The material of the lens has a 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 (mu = 1.33).

Text Solution

Verified by Experts

`20 cm`

Topper's Solved these Questions

RAY OPTICS
AAKASH SERIES|Exercise PROBLEMS ( LEVEL-II)|60 Videos
RAY OPTICS
AAKASH SERIES|Exercise EXERCISE (VERY SHORT ANSWER QUESTIONS )|53 Videos
PRACTICAL PHYSICS
AAKASH SERIES|Exercise LECTURE SHEET LEVEL-II (ADVANCED) Linked Comprehension Type Questions|4 Videos
SEMICONDUCTOR DEVICES
AAKASH SERIES|Exercise EXERCISE - III|3 Videos

Similar Questions

Explore conceptually related problems

The radius of curvature of the convex face of a plano convex lens is 12cm and the refractive index of the material of the lends 1.5. Then, the focal length of the lens is

The radii of curvature of the two surfaces of a lens are 20 cm and 30 cm and the refractive index of the material of the lens is 1.5. If the lens is concave -convex, then the focal length of the lens is

A bicovex lens has radii of cuvature 20 cm each. If the refractive index of the material of the lens is 1.5, what is its focal length?

A thin lens made of a material of refractive index mu_(0) has a focal length f_(0) in air. Find the focal length of this lens if it is immersed in a liquid of refractive index mu .

A plano-convex lens has refractive index 1.6 and radius of curvature 60 cm. What is the focal length of the lens?

If radii of curvature of both convex surfaces is 20 cm, then focal length of the lens for an object placed in air in the given arrangement is

A diverging meniscus lens of radii of curvatures 25 cm and 50 cm has a refractive index 1.5. Its focal length is (in cm)

The radius of curvature of the curved surface of a plano-convex lens is 20 cm . If the refractive index of the material of the lens be 1.5 , it will

A biconvex lens has radii of curvature 20 cm and 40cm. The refractive index of the material of the lens is 1.5. An object is placed 40cm in front of the lens. Calculate the psition of the image.

AAKASH SERIES-RAY OPTICS-PROBLEMS ( LEVEL-I)

A ray of light travelling in glass (mug=3//2) is incident on a horizon...
Text Solution
|
A liquid of refractive index 1.5 is poured into a cyclindrical jar of ...
Text Solution
|
The radii of curvature of a lens are + 20 cm and + 30 cm. The material...
Text Solution
|
The radii of curvature of a lens are + 20 cm and + 30 cm. The material...
Text Solution
|
An object of size 3.0 cm is placed 14 cm in front of a concave lens of...
Text Solution
|
A concave - convex lens has faces of radii 4 cm and 3 cm respectively ...
Text Solution
|
A concave - convex lens has faces of radii 4 cm and 3 cm respectively ...
Text Solution
|
A concave - convex lens has faces of radii 4 cm and 3 cm respectively ...
Text Solution
|
If the angle of prism is 60^@ and the angle of minimum deviation is al...
Text Solution
|
A ray of light passing through a prism having refractive index sqrt2 s...
Text Solution
|
A ray of light passes through an equilateral glass prism, such that th...
Text Solution
|
A ray of light is incident at an angle of 60^(@) on the face of a pris...
Text Solution
|
A ray of light is incident normally on one of the refracting surfaces ...
Text Solution
|
For an equilateral prism, it is observed that when a ray strikes grazi...
Text Solution
|
A flint glass prism and a crown glass prism are to be combined in such...
Text Solution
|
An air bubble is seen inside a solid sphere of glass (n=1.5) of 4.0 cm...
Text Solution
|
A 5.0 diopter lens forms a virtual image which is 4 times the object p...
Text Solution
|
A convex lens of focal length 10 cm is painted black at the middle por...
Text Solution
|
A convex lens of focal length 10 cm is painted black at the middle por...
Text Solution
|
A 35 mm film is to be projected on a 20 m wide screen situated at a di...
Text Solution
|