ICSE /Class 10
Physics MCQ Based On Lenses
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ICSE Class 10 Physics Lenses
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Concave lens is also known as diverging lens.
If two thin lenses are placed in contact then combined power of lenses is the algebraic sum of power of lenses.
Diverging lens
\\(\\frac{1}{f}=\\frac{1}{v}-\\frac{1}{u}\\Rightarrow \\frac{1}{u}=\\frac{1}{v}-\\frac{1}{f}\\Rightarrow \\frac{1}{f}=\\frac{1}{30}-\\frac{1}{50}\\)
Inversely proportional
Converging lens
Optical center and Focal point
When a light beam passes through a convex lens it converges.
Converging lens
The focal length of a thin convex lens is more than that of a thick convex lens.
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