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The defect is myopia.(-sign indicates concave lens)
Focal length is -1/4.5m
That is -0.2222m or -22.2cm.
Focal length is -1/4.5m
That is -0.2222m or -22.2cm.
yugrajsingh738p5mwk5:
It can be calculated from the lens-maker's formula for thin lenses. This shows parallel beams from two helium-neon lasers converging to the principal focal point of a 30 cm double convex lens. The rays then enter a diverging lens of focal length -10cm on the right.
hiw u got -1 devided with 4.5
f=1/power
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please refer this answer in my book this was given
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