Question

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Answer 1

Answer:

Q1

The centre point of a lens is known as its optical centre

Q2

If two lens are put in contact their powers will add

P = P₁ + P₂

Power of lens = 1/focal length of lens(in meters)

Power of the combination = 1/f = -10 D

the combination of these two lenses give us a diverging lens of focal length -10cm

Q5

Using the lens formula; -1/u+1/v=1/f

rearranging, 1/v=1/18-1/27=1/54

hence 1/v=1/54.

To get the position of the image, V, find the reciprocal of 1/54.

Hence, v=54cm.

To obtain the size and nature of image,

use magnifcation formula; hi=V/u*h=54/-27*4=-8.0cm.

Therefore, size of image is 8cm.

Nature=virtual image.