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A convex lens and a concave lens, each havingsame focal length of 25 cm, are put in contact toform a combination of lenses. The power indiopters of the combination is [2006]
- a)50
- b)infinite
- c)zero
- d)25
Correct answer is option 'C'. Can you explain this answer?
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A convex lens and a concave lens, each havingsame focal length of 25 c...
From the formula,
Power of combination 
Most Upvoted Answer
A convex lens and a concave lens, each havingsame focal length of 25 c...
**Explanation:**
When two lenses are in contact, their powers are added. The power of a lens is given by the formula P = 1/f, where P is the power of the lens and f is the focal length.
Here, we have a convex lens and a concave lens, each having a focal length of 25 cm. Since the two lenses are in contact, their powers are added. The power of the convex lens is positive and the power of the concave lens is negative.
Therefore, the power of the combination of lenses is given by:
P_combination = P_convex + P_concave
= 1/25 - 1/25
= 0
Hence, the power of the combination of lenses is zero. This means that the combination of lenses does not converge or diverge the incident light rays and hence, it acts as a simple glass plate.
Therefore, the correct option is (c) zero.
When two lenses are in contact, their powers are added. The power of a lens is given by the formula P = 1/f, where P is the power of the lens and f is the focal length.
Here, we have a convex lens and a concave lens, each having a focal length of 25 cm. Since the two lenses are in contact, their powers are added. The power of the convex lens is positive and the power of the concave lens is negative.
Therefore, the power of the combination of lenses is given by:
P_combination = P_convex + P_concave
= 1/25 - 1/25
= 0
Hence, the power of the combination of lenses is zero. This means that the combination of lenses does not converge or diverge the incident light rays and hence, it acts as a simple glass plate.
Therefore, the correct option is (c) zero.
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A convex lens and a concave lens, each havingsame focal length of 25 cm, are put in contact toform a combination of lenses. The power indiopters of the combination is [2006]a)50b)infinitec)zerod)25Correct answer is option 'C'. Can you explain this answer?
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