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Subject: Science, asked on 27/10/12

define principal focus of a Convex lens and Concave lens

Subject: Science, asked on 29/12/14

An object placed at a distance of 3 cm from a concave lens of focal length 12 cm. Find the (i) position and (ii) nature of the image formed.

Subject: Science, asked on 13/11/10

define the principal focus of a convex mirror

Subject: Science, asked on 7/2/15

An object placed on a metre scale at 10.0 cm mark was focussed on a white screen placed at 90.0 cm mark using a converging lens placed on the scale at 50.0 cm mark.
(i) Find the focal length of the converging lens.
(ii) Find the position of the image formed if the object is shifted towards the lens at a position marked 30.0 cm on the scale.
(iii) List two characteristics of the image formed if the object is further shifted towards the lens.

Subject: Science, asked on 8/1/13

What is tyndall effect?Explain an example

Subject: Science, asked on 29/2/16

Show that the refractive index of a medium 1 with respect to medium 2 is reciprocal to the refractive index of medium 2 with respect to 1 i.e. n12 =  1 / n21

Subject: Science, asked on 31/1/12

A concave mirror produces three times magnified real image of an object placed 10 cm in front of it.Where is the image located

Sri
Subject: Science, asked on 1/7/17

Q 10.For the given data showing the focal length of three concave mirrors A,B,C and respective 
distance of different objects from these mirrors. Answer the following questions. 
S.no Object distance Focal length
A 45 20
B 30 15
C 20   30
a) In the given position of the object from the mirrors , which mirror will form the diminished image of 
the object. Draw Ray diagrams for image formation by this mirror 
b) Which mirror can be conveniently used up as a makeup mirror? Draw the ray diagram to illustrate 
this function 

Subject: Science, asked on 22/3/11

DEFINE RARER & DENSER MEDIUM. 

Subject: Science, asked on 12/1/17

Two thin lenses of power+2D and -1.5D are placed in contact .Find the a) power and b) focal length of the combination of lenses c) also state the nature of lens formed by the combination of these lenses. No links pls

Subject: Science, asked on 7/1/15

why a convex mirror is used as rear view mirror

Subject: Science, asked on 2/1/16

Magnification of a mirror is +2/3.what type of mirror is it

Subject: Science, asked on 4/3/12

A student focussed the image of a candle flame

on a white screen using a convex lens. He noted
down the position of the candle, screen and the
lens as under :
(a) Position of Candle = 12.6 cm
(b) Position of Convex Lens = 51.8 cm
(c) Position of Screen = 91.0 cm
(i) Calculate the focal length of the lens.
(ii) Where will the image be formed if he
shifts the candle towards the lens at a
position of 32.2 cm?
(iii) What will be the nature of the image
formed if he further shifts the candle
towards the lens?
(iv) Dr aw a r a y d i a g r am t o s h ow t h e
formation of the image in case (c) as
said above.

Subject: Science, asked on 30/1/17

the absolute refractive indices of water, benzene and diamond are 1.33, 1.50 and 2.42 respectively. what is the refractive index of (i) water w.r.t. diamond, (ii) diamond w.r.t. to benzene

Subject: Science, asked on 11/2/13

When an object is placed at a distance of 50 cm from a concave mirror , the magnification produced is - 1/2 . where should the object be placed to get a magnification of -1/5

Subject: Science, asked on 16/3/19

Q42 please reply fast

Subject: Science, asked on 17/6/10

The magnification produced by a plane mirror is +1. What does this mean?

Subject: Science, asked on 13/12/13

a person uses a concave mirror for shaving, where should he position his face in front of it?

Subject: Science, asked on 12/1/15

a convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the lens if the image size is equal to the object size. Also find the power of the lens

Subject: Science, asked on 6/10/17

A concave mirror forms a sharp image of a distant tree.What is the separation between the mirror and the screen called???

Subject: Science, asked on 24/3/13

The refractive indices of water and glass with respect to air are 4/3 and 3/2 respectively. If the speed of light in glass is 2x 108ms-1, find the speed of light in

1. Air

2. Water

Subject: Science, asked on 16/11/10

 what is 2F1,F1,F2,2F2 stands for???

Subject: Science, asked on 3/11/12

what r the properties of convex and concave mirror???

rn

 

Subject: Science, asked on 1/11/14

using mirror formula, compute the position of an object placed in front of a concave mirror with focal length 'f' so that the image formed is of the same size as object.

Subject: Science, asked on 6/2/11

Define power of lens.In what SI unit is power of lenses rated?A convex lens has a focal length of 50cm.calculate its power.

Subject: Science, asked on 3/2/16

the formula of linear magnification is m = Hi/Ho = -v/u.what determines the sign of m?what is the significance of this sign?

Subject: Science, asked on 3/1/13

find the position of an object when placed in front of a concave mirror of focal length 20 cm produces a virtual image,which is twice size of object.

Subject: Science, asked on 27/1/15

The bulb used in a torchlight is placed at a distance 'x' from the mirror used. The value of 'x' is :-

a) f/2 b) f c) f/3 d) 3f

Subject: Science, asked on 27/11/12

The magnification produced by a mirror is 1/3 then the type of mirror is --------------. Explain why?

Subject: Science, asked on 30/11/16

​using mirror formula. prove that in a plane mirror

i)object distance=image distance

ii)image is of same size and it is virtual & erect.

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