A convex lens of focal length 10 cm is placed in contact with a concave lens of focal length 20 cm. Calculate the focal length and power of the combination. State the nature of the combination so formed. (CBSE 2024)

Power of a Lens, Focal Length of Spherical Lenses | PadhAiPro

Question

TextPower of a LensFocal Length of Spherical Lenses

Similar Questions

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 ?

TextRefraction Through Rectangular Glass SlabImage Formation by Convex LensImage Formation by Concave LensSign 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.

State Snell's law of refraction of light.

Differentiate between the virtual images formed by a convex lens and a concave lens on the basis of :