Home
Class 12
PHYSICS
The focal length ofa converging lens ar...

The focal length ofa converging lens are `f_v and f_r` for violet and red light respectively.

A

`f_vgtf_r`

B

`f_v=f_r`

C

`f_vltf_r`

D

Any of the three is possible depending on the value of the average refractive index `mu`.

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • DISPERSION AND SPECTRA

    HC VERMA|Exercise Objective -2|4 Videos
  • DISPERSION AND SPECTRA

    HC VERMA|Exercise Objective 2|1 Videos
  • DISPERSION AND SPECTRA

    HC VERMA|Exercise Objective 1|1 Videos
  • CAPACITORS

    HC VERMA|Exercise Exercise|2 Videos
  • ELECTRIC CURRENT IN CONDUCTORS

    HC VERMA|Exercise Exercises|84 Videos

Similar Questions

Explore conceptually related problems

Focal length of thin lens ......

If the focal length of a lens for red and violet light rays respectively are f_R and f_V then which of the following is true relationship ?

Focal length of convex lens for red, green and blue colour are f_r , f_g , and f_b respectively, so which of the following statements is true ?

Choose the correct alternative corresponding to the object distance 'u', image distance 'v' and the focal length 'F' of a converging lens from the following . The average speed of the image as the object moves with the uniform speed from distance (3F)/(4) to (F)/(2) is greater than the average speed of the image as the object moves with same speed from distance (F)/(2) "to" (F)/(4) The minimum distance between a real object and its real image in case of a converging lens is 4F where F is its focal length.

To find the focal length of a convex mirror , a student records the following data: {:("Object Pin","Convex Lens","Convex mirror","Image Pin"),(22.2 cm,32.2 cm,45.8 cm,71.2 cm):} The focal length of the convex lens is f_(1) and that of mirror is f_(2) . Then taking index correction to be negligibly small , f_(1) and f_(2) are close to :

The following objects are placed one after each other in given order onto a central axis with a separation of 40 cm each. A point source of light O. a diverging lens of focal length 40 cm. a converging lens of focal length 40 cm and converging mirror of focal length 80 cm. The aperture diameter of lenses and mirror is d=20 cm . If a point source of light is placed at a perpendicular distance of x from central axis then. (You have to consider single optical event at any optical element) Mark the CORRECT statement(s):-

The following objects are placed one after each other in given order onto a central axis with a separation of 40 cm each. A point source of light O. a diverging lens of focal length 40 cm. a converging lens of focal length 40 cm and converging mirror of focal length 80 cm. The aperture diameter of lenses and mirror is d=20 cm. If a point source of light is placed at a perpendicular distance of x from central axis then. (You have to consider single optical event at any optical element) Mark the CORRECT statement(s):-

The focal length of the eye lens is changed due to the action of the……….

The focal length of an equiconvex lens in air i equal to either of its radii of curvature. The refractive index of the material of the lens is …........

In the figure shown a converging lens and a diverging lens of focal lengths 20cm and -5cm respectively are separated by a distance such that a paralle beam of light of intensity 100 watt//m^(2) incident on the converging lens comes out as parallel beam from the diverging lens. Find the intensity of the outgoing beam in watt//m^(2)