Suppose that the lower half of the concave mirror’s reflecting surface in the given figure is covered with an opaque (non-reflective) material. What effect will this have on the image of an object placed in front of the mirror?

 1 the image will show only half of the object 2 the image will show the whole of the object 3 the intensity of the image will be low 4 both (2) and (3)
Subtopic: Â Reflection at Spherical Surface |
Â 77%
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A mobile phone lies along the principal axis of a concave mirror, as shown in the figure. Then,

 1 the magnification is not uniform due to the length of the object along the principal axis. 2 the distortion of the image depends on the location of the phone with respect to the mirror. 3 both (1) and (2) 4 none of these

Subtopic: Â Reflection at Spherical Surface |
Â 85%
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An object is placed at $$10$$ cm in front of a concave mirror with a radius of curvature of $$15$$ cm. The magnification of the image is:
1. $$-3$$
2. $$3$$
3. $$1$$
4. $$-1$$

Subtopic: Â Reflection at Spherical Surface |
Â 74%
From NCERT
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An object is placed at $$5$$ cm in front of a concave mirror with a radius of curvature of $$15$$ cm. The nature of the image is:
1. magnified, real, and inverted
2. magnified, virtual, and erect
3. magnified, real, and erect
4. none of these

Subtopic: Â Reflection at Spherical Surface |
Â 74%
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Suppose while sitting in a parked car, you notice a jogger approaching towards you in the side view mirror of $$R= 2~\text{m}$$. If the jogger is running at a speed of $$5~\text{m/s}$$, how fast does the image of the jogger appear to move when the jogger is $$39~\text{m}$$ away?
1. $$5~\text{m/s}$$

2. $$\frac{1}{60}~\text{m/s}$$
3. $$\frac{1}{280}~\text{m/s}$$
4. $$10~\text{m/s}$$

Subtopic: Â Reflection at Spherical Surface |
Â 55%
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The earth takes $$24~\text{h}$$ to rotate once about its axis. How much time does the sun take to shift by $$1^{\circ}$$ when viewed from the earth?
1. $$3~\text{minutes}$$

2. $$2~\text{minutes}$$

3. $$1~\text{minutes}$$

4. $$4~\text{minutes}$$

Subtopic: Â Refraction at Curved Surface |
Â 60%
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Light from a point source in the air falls on a convex spherical glass surface (n = 1.5 and radius of curvature = 20 cm) of a glass medium which extends till infinity on other side . The distance of the light source from the glass surface is 100 cm. At what position the image is formed?

 1 at a distance of 200 cm from the glass surface, in the direction of incident light. 2 at a distance of 100 cm from the glass surface, in the direction of incident light. 3 at a distance of 200 cm from the glass surface, in the opposite direction of incident light. 4 at a distance of 100 cm from the glass surface, in the opposite direction of incident light.

Subtopic: Â Refraction at Curved Surface |
Â 66%
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A magician during a show makes a glass lens with $$n=1.47$$ disappear in a trough of liquid. What is the refractive index of the liquid?
1. $$1.47$$
2. $$1.33$$
3. $$0.66$$
4. $$1.5$$

Subtopic: Â Refraction at Curved Surface |
Â 79%
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If $$f=0.5$$ m for a glass lens, what is the power of the lens?
1. $$+0.4$$ D
2. $$+4.0$$ D
3. $$+0.2$$ D
4. $$+2.0$$ D

Subtopic: Â Lenses |
Â 86%
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The radii of curvature of the faces of a double convex lens are $$10$$ cm and $$15$$ cm. Its focal length is $$12$$ cm. What is the refractive index of glass?
1. $$1.3$$
2. $$1.2$$
3. $$1.5$$
4. $$1.4$$

Subtopic: Â Lenses |
Â 81%
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