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Class 10 Science
Light Reflection And Refraction
Quiz 4
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No particle can ever move at a speed greater than that of light in vacuum.
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True
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False
A ray of light goes from a medium of refractive index${{n}_{_{1}}}$ to a medium of refractive index ${{n}_{2}}$. the angle of incidence is $i$ and the angle of refraction is $r$. Then, $\frac{sin i}{sin r}$ is equal to
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$\frac{n_2}{n_1}$
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$\frac{n_1}{n_2}$
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${{n}_{2}}$
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${{n}_{1}}$
A lens has a power of $+0.5 D$. it is
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a concave lens of focal length 2m
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a convex lens of focal length 2m
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a convex lens of focal length 5cm
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a concave lens of focal length 5cm
The value of $f$ and $u$ for a concave lens are always negative by convention.
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True
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False
When two lenses are placed in contact, the focal length of the combination is equal to the sum of the focal lengths of the lenses.
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True
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False
A ray of light travelling in air falls obliquely on the surface of a calm pond. It will
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deviate towards the normal
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go into the water without deviating from its path
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deviate away from the normal
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turn back of its original path
If a ray of light passes from vacuum to a transparent medium, it will bend away from the normal.
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True
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False
The central portion of a thin lens behaves like a rectangular slab
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True
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False
A convex lens forms a virtual image when an object is placed at a distance of 18cm from it. The focal length must be
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less than 36cm
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greater than 36cm
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greater than 18cm
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less than 18cm
A thin lens and a spherical mirror have a focal length of $+15cm$ each.
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Both are concave
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Both are convex.
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The lens is convex and the mirror is concave
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The lens is concave and the mirror is convex
An object is placed before a concave lens. The image formed
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is always erect
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is always real
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is always inverted
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may be erect or inverted
The angle of reflection is the angle between
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the normal to the surface and reflected ray.
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the reflected ray and the surface of the mirror
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(i) and (ii)
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None of the above
Explanation
the normal to the surface and reflected ray.
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