A biconvex lens $\left(\mathrm{\mu }=1.5\right)$ 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 |
To view explanation, please take trial in the course below.
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To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
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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 |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
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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 $\frac{d}{2}$ 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 $\frac{I}{4}$

2.

3. f and $\frac{3I}{4}$

4.

Subtopic:  Lenses |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
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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.  $\sqrt{\frac{{\mathrm{f}}_{1}}{{\mathrm{f}}_{2}}}$

2.  $\sqrt{\frac{{\mathrm{f}}_{2}}{{\mathrm{f}}_{1}}}$

3.  $\frac{{\mathrm{f}}_{1}+{\mathrm{f}}_{2}}{{\mathrm{f}}_{1}{\mathrm{f}}_{2}}$

4.  None of the above

Subtopic:  Lenses |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
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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.

2.

3.

4.

Subtopic:  Lenses |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
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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 |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh