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OpticsQuestion and Answers: Page 2

Question Number 41906 Answers: 0 Comments: 1

A concave lens of focal length 60cm is made of material whose refractive index for red light is 1.641 and refractive index for blue light is 1.659.That for white light is 1.65.It is combined with a convex lens of dispersive power 0.0173 to form an achromatic doublet. Calculate the focal length of the achromatic lens.

$A c o n c a v e l e n s o f f o c a l l e n g t h 60 c m$ $i s m a d e o f m a t e r i a l w h o s e$ $r e f r a c t i v e i n d e x f o r r e d l i g h t i s$ $1.641 a n d r e f r a c t i v e i n d e x f o r b l u e$ $l i g h t i s 1.659 . T h a t f o r w h i t e l i g h t$ $i s 1.65 . I t i s c o m b i n e d w i t h a c o n v e x$ $l e n s o f d i s p e r s i v e p o w e r 0.0173 t o$ $f o r m a n a c h r o m a t i c d o u b l e t .$ $C a l c u l a t e t h e f o c a l l e n g t h o f t h e$ $a c h r o m a t i c l e n s .$

Question Number 41753 Answers: 2 Comments: 0

How far must a man stand in front of a concave mirror of radius 120cm in order to see an erect image of his face four times its actual size?

$H o w f a r m u s t a m a n s t a n d i n f r o n t$ $o f a c o n c a v e m i r r o r o f r a d i u s 120 c m$ $i n o r d e r t o s e e a n e r e c t i m a g e o f$ $h i s f a c e f o u r t i m e s i t s a c t u a l s i z e ?$

Question Number 38923 Answers: 1 Comments: 0

A glass prism made from a material of refractive index 1.55 has a refracting angle of 60°.The prism is immersed in water of refractive index 1.33.Determine the angle of minimum deviation for a parallel beam of light passing through the prism.

$A g l a s s p r i s m m a d e f r o m a m a t e r i a l$ $o f r e f r a c t i v e i n d e x 1.55 h a s a$ $r e f r a c t i n g a n g l e o f 60 ° . T h e p r i s m$ $i s i m m e r s e d i n w a t e r o f r e f r a c t i v e$ $i n d e x 1.33 . D e t e r m i n e t h e a n g l e o f$ $m i n i m u m d e v i a t i o n f o r a p a r a l l e l$ $b e a m o f l i g h t p a s s i n g t h r o u g h t h e$ $p r i s m .$

Question Number 38925 Answers: 1 Comments: 0

Calculate the deviation of a ray of light,which is incident on a plane mirror at an angle of 40°.

$C a l c u l a t e t h e d e v i a t i o n o f a r a y o f$ $l i g h t, w h i c h i s i n c i d e n t o n a p l a n e$ $m i r r o r a t a n a n g l e o f 40 ° .$

Question Number 38235 Answers: 0 Comments: 4

A man 2m 50cm tall stands a distance of 3m in front of a large vertical plane mirror. i)what is the shortest length of the mirror that will enable the man see himself fully? ii)what is the answer of the above if the man were 5m away?

$A m a n 2 m 50 c m t a l l s t a n d s a$ $d i s t a n c e o f 3 m i n f r o n t o f a l a r g e$ $v e r t i c a l p l a n e m i r r o r .$ $i) w h a t i s t h e s h o r t e s t l e n g t h o f t h e$ $m i r r o r t h a t w i l l e n a b l e t h e m a n s e e$ $h i m s e l f f u l l y ?$ $i i) w h a t i s t h e a n s w e r o f t h e a b o v e$ $i f t h e m a n w e r e 5 m a w a y ?$

Question Number 37945 Answers: 0 Comments: 10

Two plane mirrors are inclined at an angle of 30°.A ray of light which makes an angle of incidence of 50° with one of the mirrors,undergoes two successive reflections at the mirrors.Calculate the angle of deviation. please help....its urgent

$T w o p l a n e m i r r o r s a r e i n c l i n e d a t$ $a n a n g l e o f 30 ° . A r a y o f l i g h t w h i c h$ $m a k e s a n a n g l e o f i n c i d e n c e o f 50 °$ $w i t h o n e o f t h e m i r r o r s, u n d e r g o e s$ $t w o s u c c e s s i v e r e f l e c t i o n s a t t h e$ $m i r r o r s . C a l c u l a t e t h e a n g l e o f$ $d e v i a t i o n .$ $p l e a s e h e l p . . . . i t s u r g e n t$

Question Number 36068 Answers: 0 Comments: 1

Why is it not advisable to use small incident angle when performing experiment on refraction using a triangular prism?

$W h y i s i t n o t a d v i s a b l e t o u s e$ $s m a l l i n c i d e n t a n g l e w h e n p e r f o r m i n g$ $e x p e r i m e n t o n r e f r a c t i o n u s i n g a$ $t r i a n g u l a r p r i s m ?$

Question Number 35876 Answers: 0 Comments: 3

please help why is it not advisable to use a small angle of incidence when performing experiment on refraction in a rectangular prism????

$p l e a s e h e l p$ $w h y i s i t n o t a d v i s a b l e t o u s e a$ $s m a l l a n g l e o f i n c i d e n c e w h e n$ $p e r f o r m i n g e x p e r i m e n t o n r e f r a c t i o n$ $i n a r e c t a n g u l a r p r i s m ? ? ? ?$

Question Number 27948 Answers: 0 Comments: 0

what is relation between intensity of diffraction pattern .slit width?

$w h a t i s r e l a t i o n b e t w e e n$ $i n t e n s i t y o f d i f f r a c t i o n$ $p a t t e r n . s l i t w i d t h ?$

Question Number 27655 Answers: 0 Comments: 0

what is reration betwen int ensity o diffraction and sli t witdh

$w h a t i s r e r a t i o n b e t w e n i n t$ $e n s i t y o d i f f r a c t i o n a n d s l i$ $t w i t d h$

Question Number 27751 Answers: 0 Comments: 0

what is relation between in tensity of diffraction anx slit width

$w h a t i s r e l a t i o n b e t w e e n i n$ $t e n s i t y o f d i f f r a c t i o n a n x$ $s l i t w i d t h$

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