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Subject: Physics, asked on 23/1/16

dear expert

what is the relation between f and r if the lens is double convex lens ..

EXPLAIN ME HOW U DETERMINE THAT....

Subject: Physics, asked on 15/9/15

while performing a practical of convex mirror, when object is placed in between centre and focus:Sir/Madam, can you please suggest what is the easiest way to calculate the rough hand focal length?

Subject: Physics, asked on 20/8/15

a fish is rising up vertically inside a pond with velocity 4cm/s,and notices a bird,which is diving vertically downward along same vertical lines as that of fish and its velocity appears to be 16cm/s(to the fish).what is real velocity of the diving bird, if refractive index of water is 4/3

Subject: Physics, asked on 30/1/20

Please explain this question :

Subject: Physics, asked on 16/8/16

a glass lens has a focal length of 150cmin water and is converging. find the focal length of an air lens of same shape in water given that refractive index of air glass =1.624 and for air water =1.333

Subject: Physics, asked on 16/8/16

A planoconvex lens of focal length 120 cm has radius of curvature of its convex surface as 60 cm . Calculate the focal length of the lens when immersed in water . take refractive index of water =4/3.

Subject: Physics, asked on 16/8/16

if refractive index from air to glass is 3/2 and from air to water is 4/3 , find the ratio of focal length of a glass lens in water and in air.

Subject: Physics, asked on 14/8/16

Dispersive power is a property of prism or material????

Subject: Physics, asked on 17/7/16

please answer ASAP

Subject: Physics, asked on 8/6/16

if 2 lenses are kept coaxial together what will be their power?explain.

Subject: Physics, asked on 2/6/16

A luminous object is placed at a distance of 30 cm from the convex lens of focal length 20 cm. On the other side of the lens, at what distance from the lens a convex mirror of radius of curvature 10 cm be placed in order to have an upright image of the object coincident with it.

Subject: Physics, asked on 26/5/16

a telescope has an objective lens of focal length 200 cm and eyepiece with focal length 2cm . if this telescope is used to see a 50 m tall building at distance of 2km, what is the height of image of the building formed by the objective lens?

Subject: Physics, asked on 26/5/16

a lens is made of flint glass (refractive index= 1.5) . when the lens is immersed in liquid of refractive index 1.25, the focal length is

Subject: Physics, asked on 1/5/16

2 lenses have 10 D power each and they r separated by a distance .Beyond which distance does the power of the combination change from positive to negative

Subject: Physics, asked on 1/5/16

the refracting angle of a prism is A and the refractive index of the material of a prism is cot A/2. what is the angle of minimum deviation

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