Each question contains Statement I (Assertion) and Statement II (Reason). Each question has 4 choices (a), (b), (c), and (d) out of which ONLY ONE is correct. So, select the correct choice.
Assertion-Reason
Statement I: A convex lens forms a real image of a real-extended object.
Statement II: A convex lens is an example of a spherical lens and is converging in nature.
A
Statement I is True, Statement II is True; Statement II is a correct explanation for Statement I
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B
Statement I is True, Statement II is True; Statement II is NOT a correct explanation for Statement I
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C
Statement I is True, Statement II is False
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D
Statement I is False, Statement II is True
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Solution
The correct option is D
Statement I is False, Statement II is True
Step 1: Explanation for the Statement I
A convex lens forms a real image of a real-extended object.
1. When an object is placed at infinity, the real image is formed at the focus. The size of the image is much smaller than that of the object.
2. When an object is placed behind the center of curvature, the real image is formed between the center of curvature and focus. The size of the image is the same as compared to that of the object.
3. When an object is at the center of curvature, the real image is formed at the other center of curvature. The size of the image is the same as compared to that of the object.
4. When an object is placed in between the center of curvature and focus, the real image is formed behind the center of curvature. The size of the image is larger than that of the object.
5. When an object is placed in between focus and pole, a virtual image is formed. The size of the image is larger than that of the object.
When we place an object beyond the focus of a convex lens then the image we get is the real image of a real-extended object but when the object is placed between F and pole, then a virtual image will form.
Thus, statement I is false.
Step 2: Explanation for the Statement II
A convex lens is an example of a spherical lens and is converging in nature.
"Lens is a piece of transparent glass bounded by two spherical surfaces."
There are two types of lenses: -
Convex lens: Convex lenses are also known as converging lenses since the rays converge after falling on the convex lens.
Concave lens: The concave lenses are known as diverging lenses as the rays diverge after falling on the concave lens.
