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# CBSE Class 10 Free Doubts and Solutions

## I WANT TO UNDERSTAND LENS FORMULAE

Asked by deevyanshkumarsingh 23rd March 2019, 9:00 AM

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## Two plane mirrors are inclined to each other in such a way that a ray of light moving parallel to one mirror comes out parallel to the other mirror after two reflections. find the angle between the mirrors

Asked by rushabhjain.a 22nd March 2019, 9:25 PM

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## An object is placed in front of a concave mirror of focal length f. A virtual image of magnification 2 is formed.How for must the object be moved from original position so that a real image of same size is formed.

Asked by rushabhjain.a 22nd March 2019, 9:24 PM

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## Two plane mirrors are inclined to each other at some angle. A ray of light incident at 30∘ on one mirror after reflection from the other mirror retracts its path. what will be the angle between the mirror?

Asked by rushabhjain.a 22nd March 2019, 9:23 PM

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## Two mirror one concave of radius of curvature 0.4m and another convex mirror of radius of curvature 0.2m are kept facing each other which are 0.5m apart. An object is placed between two mirrors, 0.25m from concave mirror. Where is the image formed after two reflections.

Asked by rushabhjain.avv 22nd March 2019, 9:20 PM

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## A person looks in to a spherical mirror . The size of image of his face is twice the actual size of his face. If the face is at distance 20 cm then find the radius of curvature of mirror.

Asked by rushabhjain.avv 22nd March 2019, 9:06 PM

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## (i)Why does the sun appear reddish at sunset or sunrise?  (ii) For which colour, the refractive index of prism material is maximum and  minimum?

Asked by rushabhjain.avv 22nd March 2019, 4:59 PM

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## how to practice for editing and ommision.

Asked by ABHILASHA 22nd March 2019, 3:03 PM
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## what are the imporatnt questions from the novel the story of my life...plzz tell

Asked by ABHILASHA 22nd March 2019, 3:01 PM
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## format of formal and informal letter

Asked by yashmishra6961 22nd March 2019, 2:56 PM
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