### Class X

Question 8:  in a concave mirror, an object placed _ will result in a vitrual image .
1. twice the distance of the focalpoint
2. between the focal point and mirror
3. between the focal point and twice the distance of the focal point
4. past the focal point
Question 7:  In case of refraction through a glass slab
1. Incident ray is parallel to the refracted ray
2. Incident ray is parallel to the emergent ray
3. Angle of incidence is equal to the angle of refraction
4. Angle of refraction is equal to the angle of emergence
Question 4:  Formula to find the refractive index of a medium is
1. n=speed of light in the medium /speed of light in air
2. n=1 /speed of light in air
3. n=speed of light in the air/speed of light in the medium
4. n=1 /speed of light in the medium
Question 5:  Coin placed in a bowl when seen from a place just disappears. When water is poured into the bowl without disturbing the coin , the coin
1. Will not be seen
2. Appears above the water surface
3. Becomes visible again
4.  Appears very much deep inside the water
Question 1:  Mirror formula is
1. 1/v-1/u =1/f
2. M=v/u
3. 1/v+1/u =1/f
4. M=h/h
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