An object is kept at a distance of 60cm in front of a convex lens. Its real and inverted image is formed ag a distance of 20cm from the lens.find the focal length of the lens
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u=-60
v=20
1/f=1/v-1/u
=1/20+1/60
=3+1 /60
=4/60
f=15 cm
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3) Solve by
4) Difference between two numbers is 3, the sum of three times the bigger
number and two times the smaller number is 19. Then find the numbers.
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