Question

ve
nent used by dentist.
palmist used a special lens
nu Teason for its use in the instrument used
OR
Rishi went to a palmist to show his palm. The palmis
for this purpose.
(1) State the nature of the lens and reason for its use
Where should the palmist place/hold the lens so
magnified image of an object ?
(111) If the focal length of this lens is 10 cm and the
distance of 5 cm from the palm, use lens formula
and size of the image.
a the lens so as to have a real and
S is 10 cm and the lens is held at a
se lens formula to find the position
.31/3/1.
21
ORA
23​

Answer 1

Answer: v = -10

M= +2

Virtual and erect

Magnified

Convex lens (converging)

Between F1 and 2F1 ray diagram can explain position of lens

Explanation:

Answer 2

Answer:

1. Lens used by the palmist is a convex lens so as to form a magnified image of an object.

2. Palmist should hold the lens at the focus so as to get the real and magnified image of an object

3.F=5cm

Object distance=5cm

Image distance=?

1/F =1/v+1/u

I/10=1/v+1/5

1/v=1/10+1/5

1+2/10=1/v

3/10=1/v

10/3=1/v

Ans. 3.3

Explanation: