A biconvex lens μ=1.5 has a radius of curvature of magnitude 20 cm. Which one of the following options, best describes, the image formed by an object of height 2 cm placed 30 cm from the lens?

1. virtual, upright, height = 0.5 cm
2. real, inverted, height = 4 cm
3. real, inverted, height = 1 cm
4. virtual, upright, height = 1 cm

Subtopic:  Lenses | Lens Makers' Formula | Refraction at Curved Surface |
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A converging beam of rays is incident on a diverging lens. Having passed through the lens the rays intersect at a point 15 cm from the lens on the opposite side. If the lens is removed the point where the rays meet will move 5 cm closer to the lens. The focal length of the lens is :

1. 5 cm
2. -10 cm
3. 20 cm
4. -30 cm

Subtopic:  Lenses |
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A lens having focal length f and aperture of diameter d forms an image of intensity I . An aperture of diameter d2 in central region of lens is covered by a black paper. The focal length of lens and intensity of the image now will be respectively:

1. f and I4

2. 3f4 and I2

3. f and 3I4

4. f2 and I2

Subtopic:  Lenses |
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Two thin lenses of focal lengths f1 and f2 are in contact and coaxial. The power of the combination is :

1.  f1f2

2.  f2f1

3.  f1+f2f1f2

4.  None of the above

Subtopic:  Lenses |
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A boy is trying to start a fire by focusing sunlight on a piece of paper using an equiconvex lens of focal length 10 cm. The diameter of the sun is 1.39 x109 m and its mean distance from the earth is 1.5 x 1011 m. What is the diameter of the sun's image on the paper?

1.  9.2×10-4 m

2.  6.5×104 m

3.  6.5×10-5 m

4.  12.4×10-4 m

Subtopic:  Lenses |
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A convex lens and a concave lens, each having the same focal length of 25 cm, are put in contact to form a combination of lenses. The power in dioptres of the combination is:

1. 25

2. 50

3. infinite

4. zero

Subtopic:  Lenses |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology