Home
Class 10
PHYSICS
Old people sometimes use bifocal glasses...

Old people sometimes use bifocal glasses.

Text Solution

Verified by Experts

(i) Few old people, suffer from both myopia and hypermetropia.
(ii) In such cases a bifocal lens is required to correct the defect. The upper part is concave lens to correct myopia and lower part is convex lens to correct hyp ermetropia.
(iii) The concave lens is useful for distant object vision and convex lens for nearby object vision.
(iv) Hence, old people sometimes use bifocal glasses.
Promotional Banner

Topper's Solved these Questions

  • LENSES

    CHETAN PUBLICATION|Exercise Answer the following questions:|16 Videos

  • LENSES

    CHETAN PUBLICATION|Exercise Draw well labelled diagrams for the following.|11 Videos

  • LENSES

    CHETAN PUBLICATION|Exercise Distinguish between:|3 Videos

  • HEAT

    CHETAN PUBLICATION|Exercise ASSIGNMENT - 5 (Answer the following: (Any 1))|3 Videos

  • MODEL ACTIVITY SHEET

    CHETAN PUBLICATION|Exercise SOLVE THE FOLLOWING QUESTIONS : (ANY 1)|9 Videos

Similar Questions

Explore conceptually related problems

To clean the spectacles,people often breathe out on glasses to make them wet. Explain why do the glasses become wet.

A passing aeroplane sometimes causes the rattling of the windows of house. Give reason.

The induced emf is sometimes called back emf. Why?

Ordinary glass is

There are certain NGOs which ask people to donate their used clothes, toys, school books, house hold items. These NGOs segreagate the collected items and distribute them to the needy people. What objectives do these NGOs fulfil by this initiatives.?

Assertion : When the car engine is started with headlights turned on, they sometimes become bright. Reason : A galvanometer is extensively useful to compare the potential difference between various parts of the circuit.

A lady uses + 1.5 D glasses to have normal vision from 25 cm onwards. She uses a 20 D lens as a simple microscope to see an object. Find the maximum magnifying power if she uses the microscope (a) together with her glass (b) without the glass. Do the answers suggest that an object can be more clearly seen through a microscope without using the correcting glasses?