Question

A student conducts an experiment using a convex lens of focal length 12 cm and an object of height 15 cm. He placed the object at 36 cm from the lens. find the position, nature and size of the image?

pls help ASAP​

Answer 1

Answer:

Answer

(a) When object come closer then image go aways from the lens,

So 100cm;60cm;40cm;30cm;24cm

(b) When u=−25cm,v=100cm

v

1

−

u

1

=

f

1

100

1

−

−25

1

=

f

1

f

1

=

100

5

f=20cm

When u=−90cm,v = ?

v

1

−

u

1

=

f

1

v

1

−

−90

1

=

20

1

20

1

=

20

1

−

90

1

v

1

=

180

7

v=25.7cm

(c) 25cm

(d) 20cm (As calculated in part(b))

Answer 2

Answer:

we should put our brain I will tell you

Explanation:

12cm lenght of focus length he multiple the 12x3= 36

15cm is the weight of convex lens 15x3= 45