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Answer 1

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asn. no.. 10...

There are three laws which govern Reflection and Refraction. These can be very easily derived from geometry.They are:

Angle of Incident Ray with Normal(i) EQUALS Reflected Ray with Normal(r).(i=r)

Popularly known as SNELL'S LAW it is n1*sin i=n2*sin e where i is same as above,e is angle of refracted beam with normal.

The INCIDENT ray,REFLECTED ray, REFRACTED ray and the NORMAL at the point of incidence all lie in the same plane.The plane is referred as plane of incidence.

no. 11. is

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12th

Physics

Ray Optics and Optical Instruments

Combination of Mirror and Lenses

A convex lens has focal len...

PHYSICS

A convex lens has focal length 20 cm. Calculate at what distance from the lens should the object be placed so that it forms an image at 40 cm on the other side of the lens. State the nature of the image formed.

December 26, 2019Vinutha Shiwankar

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ANSWER

f=20cm

and v=40cm

v1−u1=f1

⟹401−u1=201

⟹u1=40−1

⟹u=−40cm

magnification m=uv=−4040=−1

Hence, the image formed is real , inverted and of same size as that of the object

Explanation:

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