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CBSE Class 10 Answered

1) WHAT SHOULD  BE THE MINIMUM HEIGHT OF A PLANE MIRROR TO ENABLE A PERSON OF HEIGHT 6 FEET TO SEE HIS FULL IMAGE?
 
2)WHAT IS THE MIN. DISTANCE B/W AN OBJECT AND ITS REAL IMAGE FORMED BY CONVEX LENS OF FOCAL LENGTH 20 CM?
 
3)CAN ABSOLUTE REFRACTIVE INDEX BE LESS THAN UNITY?
 
4) WHAT SHOULD BE THE POSITION OF AN OBJECT RELATIVE TO A BICONVEX LENS SO THAT IT BEHAVES LIKE A MAGNIFIER?
 
5) A SMALL INK DROP ON A PAPER IS VIEWD NORMALLY THROUGH A GLASS SLAB OF THICKNESS 10 CM AND REFRACTIVE INDEX 1.5 . BY WHAT HEIGHT WOULD THE APPEAR TO BE RAISED?
 

Asked by Sanmit Ratnaparkhi | 13 Nov, 2014, 11:51: AM
answered-by-expert Expert Answer

 

The minimum height of plane mirror to enable a person to see full image is ½ of his height.

According to the principle of reflection, the angle of incidence is equal to angle of refraction. When the ray of light travels from bottom to top of a person and reaches his eyes, then he is able to see the clear image. Here, the ray from the foot strikes the mirror at its bottom and reaches his eye after reflecting from the mirror. Hence, the height of the mirror should be 3 feet.

Note:Kindly ask other queries as separate separate query.

Answered by Priyanka Kumbhar | 13 Nov, 2014, 05:16: PM

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