Advertisements
Advertisements
Question
State the position of object, position of image, nature of image when: Convex lens is used as an erecting lens in terrestrial telescope.
Solution
Object is at 2F1. Image is formed at 2F2. Image is the real; inverted and same size as object.
APPEARS IN
RELATED QUESTIONS
You eye contains a convex lens. Why is it unwise to look at the sun?
List some things that convex lens and concave mirror have in common.
The focal lengths of four convex lenses P, Q, R and S are 20 cm, 15 cm, 5 cm and 10 cm, respectively. The lens having greatest power is :
(a) P
(b) Q
(c) R
(d) S
A convex lens of focal length 10 cm is placed in contact with a concave lens of focal length 20 cm. The focal length of this combination of lenses will be:
(a) +10 cm
(b) +20 cm
(c) −10 cm
(d) −20 cm
A lens forms an inverted image of an object. Name the kind of lens.
State two applications of a convex lens.
State two applications of a convex lens.
Define the principal focus of a convex lens.
The above image shows a thin lens with a focal length of 5m.
- What is the kind of lens shown in the above figure?
- If a real inverted image is to be formed by this lens at a distance of 7m from the optical centre, then show with calculation where should the object be placed.
- Draw a neatly labelled diagram of the image formation mentioned in (ii).
Distinguish between:
Concave lens and Convex Lens