Observe the following diagram showing an image formation in an eye : (a) Identify the defect of vision shown in the figure. (b) List its two causes and suggest a suitable corrective lens to overcome this defect.

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TextCorrection of Vision Defects Using LensesCBSE PYQ

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An old person is suffering from an eye defect caused by weakening of ciliary muscles and diminishing flexibility of the eye lens. If the defect of vision is 'a' which can be corrected by lens 'b', then 'a' and 'b' respectively are :

MCQ (Single)PresbyopiaCorrection of Vision Defects Using Lenses

The power of a lens 'X' is – 2·5 D. Name the lens and determine its focal length in cm. For which eye defect of vision will an optician prescribe this type of lens as a corrective lens ?

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Refraction Through Rectangular Glass Slab

Image Formation by Convex Lens

Image Formation by Concave Lens

Sign Convention for Spherical Lenses

Magnification by Spherical Lenses

Power of a Lens

Myopia or Near-sightedness

Correction of Vision Defects Using Lenses

"The value of magnification 'm' for a lens is – 2." Using new Cartesian Sign Convention and considering that an object is placed at a distance of 20 cm from the optical centre of this lens, state :

CASE_STUDIESRefraction Through Rectangular Glass SlabImage Formation by Convex LensImage Formation by Concave LensSign Convention for Spherical LensesMagnification by Spherical LensesPower of a LensMyopia or Near-sightednessCorrection of Vision Defects Using LensesLens Formula and Magnification for Thin Lenses

The numerical values of the focal lengths of two lenses A and B are 10 cm and 20 cm respectively. Which one of the two will show higher degree of convergence/divergence ? Give reason to justify your answer.

TextRefraction Through Rectangular Glass SlabImage Formation by Convex LensImage Formation by Concave LensSign Convention for Spherical LensesMagnification by Spherical LensesPower of a LensMyopia or Near-sightednessCorrection of Vision Defects Using Lenses

Draw a ray diagram to show the refraction of a ray of light through a rectangular glass slab when it falls obliquely from air into glass.

TextRefraction Through Rectangular Glass SlabImage Formation by Convex LensImage Formation by Concave LensSign Convention for Spherical LensesMagnification by Spherical LensesPower of a LensMyopia or Near-sightednessCorrection of Vision Defects Using Lenses

State Snell's law of refraction of light.

TextRefraction Through Rectangular Glass SlabImage Formation by Convex LensImage Formation by Concave LensSign Convention for Spherical LensesMagnification by Spherical LensesPower of a LensMyopia or Near-sightednessCorrection of Vision Defects Using LensesSnell's Law and Laws of Refraction of Light