Question

we are given a convex lens of focal length 20 cm . Draw ray diagrams ro show the nature ,size and position of the image formed when the object is kept at distance of 55 cm, from the lens ​

Answer 1

Answer:

u= -55

f= +20

using lens formula:

1/v -1/u= 1/f

1/v= 1/f+ 1/u

1/v= 1/20-1/55

$1 \div v = (55 - 20) \div 1100$

$= 35 \div 1100$

$= 7 \div 220$

v= 220/7 = 31.42

m= -v/u

m= -31.4/-55

m= 0.57

since m<1 the size of the image is diminished and the positive sign in magnification indicates that it is real ans inverted.

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