﻿ As shown in figure, a convergent lens is placed inside a cell filled with liquid. The lens has focal length +20cm when in air, and its material has refractive index 1.50. If the liquid has refractive index 1.60, the focal length of the system is:                                                                                        : Kaysons Education

# As Shown In Figure, A Convergent Lens Is Placed Inside A Cell Filled With Liquid. The Lens Has Focal Length +20cm When In Air, And Its Material Has Refractive Index 1.50. If The Liquid Has Refractive Index 1.60, The Focal Length Of The System Is:

#### Video lectures

Access over 500+ hours of video lectures 24*7, covering complete syllabus for JEE preparation.

#### Online Support

Practice over 30000+ questions starting from basic level to JEE advance level.

#### National Mock Tests

Give tests to analyze your progress and evaluate where you stand in terms of your JEE preparation.

#### Organized Learning

Proper planning to complete syllabus is the key to get a decent rank in JEE.

#### Test Series/Daily assignments

Give tests to analyze your progress and evaluate where you stand in terms of your JEE preparation.

## Question

### Solution

Correct option is

– 100 cm

#### SIMILAR QUESTIONS

Q1

Focal length of a convex lens will be maximum for:

Q2

A concave mirror is focal length f in air is used in a medium of refractive index 2. What will be the focal length of the mirror in the medium?

Q3

A luminous object is placed at a distance of 30 cm from a convex lens of focal length 20 cm. On the other side of the lens, at what distance from the lens must a convex mirror of radius of curvature 10 cm be placed in order to have an upright image of the object coincident with it

Q4

The far-point of a short-sighted eye is 200 cm. The power of the lens is:

Q5

The near point of a short-sighted person is 10 cm and he desires to read a book 30 cm away from him. The power of the lens to be used by him is:

Q6

The distance between an object and the screen is 100 cm. A lens produces an image on the screen when placed at either of the positions 40 cm apart. The power of the lens is:

Q7

A thin equiconvex lens has focal length 10 cm and refractive index 1.5. One of its faces is now silvered and for an object placed at a distance u in front of the lens, the image coincides with the object. The value of u is:

Q8

The plane face of a plano-convex lens of focal length 20 cm is silvered. What type of mirror will it become and of what focal length

Q9

A convex lens of focal length 20 cm is cut into two equal parts so as to obtain two plano-convex lenses as shown in figure. The two parts are then put in contact as shown in figure. What is the focal length of the combination?

Q10

A plano-convex lens of f = 20 cm is silvered at plane surface. Now, f will be (μ = 1.5):