5. Both a spherical mirror and a thin spherical lens have a focal length of (-) 15 cm. What type of mir
and lens are these?
6. The image formed by a concave mirror is observed to be real, inverted and larger than the obje
Where is the object placed?
Or
Name the part of a lens through which a ray of light passes without suffering any deviation.
7. In the arrangement shown in figure there are two coils wound on a non-conducting cylindrical
Initially the key is not inserted in the circuit. Later the key is inserted and then removed sha
after.
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Explanation:
Now,,,
5. since the focal length is negative i.e. f=-15 cm ,the spherical lens is concave lens as the focal length is negative for diverging lens and in case of mirrors, it is convex mirror where the focal length is negative.
6. When the position of object is between the pole of mirror and its principal focus, the image formed by a concave mirror is observed to be virtual, erect and larger than the object.
(or)
The optical Centre is The part of the lens through which the ray of the light passes without suffering any kind of deviation.
7. We can see that the current in the first coil changes, the magnetic field associated with it also changes.
Therefore, the magnetic field lines around the other coil also change.
Because of it , a momentary deflection in galvanometer will be observed which will end out soon.
Now , because of to similar conclusion, a momentary deflection is again observed in opposite direction when key is removed.
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