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Refraction at a Spherical Surface and Lenses

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Estimated time: 4 minutes
Maharashtra State Board: Class 11

Definition: Spherical Aberration (Lens)

The aberration caused by the spherical shape of the lens, where light rays at the edges focus at a different point than those near the centre, leading to a blurred image, is called spherical aberration.

Maharashtra State Board: Class 11

Definition: Chromatic Aberration

The aberration that occurs due to the lens refracting different wavelengths of light at different angles, resulting in an image consisting of different colours without a single focussed image, is called chromatic aberration.

Maharashtra State Board: Class 11

Formula: Refractive Index

n = \[\frac {\text {sin i}}{\text {sin r}}\] = \[\frac {c}{v}\] = \[\frac {\text {Real depth}}{\text {Apparent depth}}\]

Maharashtra State Board: Class 11

Formula: Apparent Depth (Glass Slab)

d = t - \[\frac {t}{μ}\] = t\[\left(1-\frac{1}{\mu}\right)\]

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