The focal length of lens of refractive i...

The focal length of lens of refractive index `1.5` in air is `30 cm` When it is immersed in water of refractive index `(4)/(3)` ,then its focal length will be

`30 cm`

`60 cm`

`120 cm`

`240 cm`

Text Solution

Verified by Experts

The correct Answer is:

Topper's Solved these Questions

RAY OPTICS
ERRORLESS |Exercise Refraction of Light at Plane Surfaces|9 Videos
RAY OPTICS
ERRORLESS |Exercise Refraction at Curved Surface|8 Videos
MAGNETISM
ERRORLESS |Exercise Assertion & Reason|1 Videos
WAVE OPTICS
ERRORLESS |Exercise SET|23 Videos

Similar Questions

Explore conceptually related problems

The focal length of lens of refractive index 1.5 in air is 30cm When it is immersed in water of refractive index (4)/(3) ,then its focal length will be

A thin lens of refractive index 1.5 has focal length of 15 cm in air. When the lens is placed is a medium of refractive index (4)/(3), its focal length will become …..cm.

A convex lens of focal length 0.24 m and of refractive index 1.5 is completely immersed in water of refractive index 1.33. Find the change in focal length of the lens.

A convex lens of focal length 20 cm made of glass of refractive index 1.5 is immersed in water having refractive index 1.33 . The change in the focal length of lens is

Focal length of a convex lens of refractive index 1.5 is 2 cm. Focal length of lens when immersed in a liquid of refractive index 1.25 will be

A lens is made of flint glass (refractive index =1.5 ). When the lens is immersed in a liquid of refractive index 1.25 , the focal length:

A convex lens made of a glass of refractive index 3//2 has a focal length 'f' in air. If it is immersed into water of refractive index 4//3 , then with calculation, predict the new focal length of the lens inside water.

ERRORLESS -RAY OPTICS-SET

The focal length of lens of refractive index 1.5 in air is 30 cm When ...
Text Solution
|
In an astronomical telescope in normal adjustment a straight black lin...
Text Solution
|
Three lenses L(1) , L(2) , L(3) are placed co-axially as shown in figu...
Text Solution
|
An object is placed at a point distant x from the focus of a convex le...
Text Solution
|
The diameter of the eye-ball of a normal eye is about 2.5 cm . The pow...
Text Solution
|
In a thin spherical fish bowl of radius 10 cm filled with water of ref...
Text Solution
|
A small fish 0.4 m below the surface of a lake is viewed through a sim...
Text Solution
|
A water drop in air refractes the light ray as
Text Solution
|
Which of the following ray diagram show physically possible refraction...
Text Solution
|
Following figure shows the multiple reflections of a light ray along a...
Text Solution
|
When the rectangular metal tank is filled to the top with an unknown l...
Text Solution
|
A concave mirror and a converging lens (glass with mu = 1.5) both have...
Text Solution
|
A ray of light strikes a plane mirror M at an angle of 45^(@) as shown...
Text Solution
|
A slab of glass, of thickness 6 cm and refractive index 1.5, is placed...
Text Solution
|
A point source of light S is placed at the bottom of a vessel containi...
Text Solution
|
A point object is placed midway between two plane mirrors a distance a...
Text Solution
|
A convergent beam of light is incident on a convex mirror so as to con...
Text Solution
|
PQR is a right angled prism with other angles as 60^(@) and 30^(@). Re...
Text Solution
|
When a ray is refracted from one medium to another, the wavelength cha...
Text Solution
|
Two this lenses, when in contact, produce a combination of power +10 d...
Text Solution
|
The plane faces of two identical plano convex lenses, each with focal ...
Text Solution
|