Home
Class 12
PHYSICS
A convex lens is placed over a plane mir...

A convex lens is placed over a plane mirror. A pin is now positioned so that there is no parallax between the pin and its image formed by this lens-mirror combination. How can this observation be used to find the focal length of the convex lens? Give appropriate reasons in support of your answer.

Text Solution

AI Generated Solution

To find the focal length of a convex lens placed over a plane mirror using the observation of a pin and its image, we can follow these steps: ### Step-by-Step Solution: 1. **Setup the Experiment**: Place a convex lens on top of a plane mirror. Position a pin (object) in front of the lens at a certain distance. 2. **Adjust the Position of the Pin**: Move the pin until there is no parallax between the pin and its image formed by the lens-mirror combination. This means that the pin and its image coincide tip-to-tip. ...
Promotional Banner

Topper's Solved these Questions

  • RAY OPTICS AND OPTICAL INSTRUMENTS

    MODERN PUBLICATION|Exercise PRACTICE PROBLEMS (1)|13 Videos

  • RAY OPTICS AND OPTICAL INSTRUMENTS

    MODERN PUBLICATION|Exercise PRACTICE PROBLEMS (2)|9 Videos

  • NUCLEI

    MODERN PUBLICATION|Exercise CHAPTER PRACTICE TEST FOR BOARD EXAMINATION|15 Videos

  • SEMICONDUCTOR ELECTRONICS METERIALS DEVICES AND SIMPLE CIRCUITS

    MODERN PUBLICATION|Exercise CHAPTER PRACTICE TEST FOR BOARD EXAMINATION|12 Videos

Similar Questions

Explore conceptually related problems

A convex lens of focal length 15 cm is placed on a plane mirror. An object is placed at 30 cm from the lens. The image is

A convex lens of focal length 15 cm is placed on a plane mirror. An object is placed 20 cm from the lens. The image is formed

A convex lens is placed in contact with a plane mirror. An axial point object at a distance of 20 cm from this combination, has its image coinciding with itself. What is the focal length of the convex lens ?

Write three characteristics of the image formed by a convex lens when the object is placed at a distance greater than twice the focal length of convex lens.

The same size images are formed by a convex lens when the object is placed at 20cm or at 10cm from the lens. The focal length of convex lens is ____ cm

Analyse the following observation table showing variation of image distance (v) with object distance (u) in case of a convex lens and answer the questions that follow, without doing any calculation : What is the focal length of the convex lens? Give reason in support of your answer.

A convex lens of focal length 15 cm , and a concave mirror of radius of curvature 20 cm are placed co-axially 10 cm apart. An object is placed in front of convex lens so that there is no parallax between the object and its image formed by the combination. Find the position of the object.

A thin convex lens of focal length 'f' is put on a plane mirror as shown in the figure . When an object is kept at a distance 'a' from the lens - mirror combination , its image is formed at a distance (a)/(3) in front of the combination . The value of 'a' is :-