SATHEE: Optics 3 Question 16

Optics 3 Question 16

16. A point object is placed at a distance of $20 c m$ from a thin plano-convex lens of focal length $15 c m$ . The plane surface of the lens is now silvered. The image created by the system is at

(2006, 3M)

(a) $60 c m$ to the left of the system

(b) $60 c m$ to the right of the system

(d) $12 c m$ to the right of the system

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Answer:

Correct Answer: 16. (c)

Solution:

Refraction from lens : $\frac{1}{v_{1}} - \frac{1}{- 20} = \frac{1}{15}$

$∴ v = 60 c m +$ ve direction

i.e. first image is formed at $60 c m$ to the right of lens system.

Reflection from mirror

After reflection from the mirror, the second image will be formed at a distance of $60 c m$ to the left of lens system.

Refraction from lens

$\frac{1}{v_{3}} - \frac{1}{60} = \frac{1}{15} \leftarrow + ve direction$

Therefore, the final image is formed at $12 c m$ to the left of the lens system.

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Optics 3 Question 16

16. A point object is placed at a distance of $20 c m$ from a thin plano-convex lens of focal length $15 c m$ . The plane surface of the lens is now silvered. The image created by the system is at

Answer:

Reflection from mirror

Refraction from lens

इंजीनियरिंग की तैयारी

चिकित्सा तैयारी

एनसीईआरटी पुस्तकें और समाधान

महत्वपूर्ण संसाधन

अन्य संसाधन

पाठ्यक्रम

परीक्षा मंच

नमूना मॉक टेस्ट

सदस्यता

एनसीईआरटी व्यायाम वीडियो समाधान

Optics 3 Question 16

16. A point object is placed at a distance of 20cm from a thin plano-convex lens of focal length 15cm. The plane surface of the lens is now silvered. The image created by the system is at

Answer:

Reflection from mirror

Refraction from lens

इंजीनियरिंग की तैयारी

चिकित्सा तैयारी

एनसीईआरटी पुस्तकें और समाधान

महत्वपूर्ण संसाधन

अन्य संसाधन

पाठ्यक्रम

परीक्षा मंच

नमूना मॉक टेस्ट

सदस्यता

एनसीईआरटी व्यायाम वीडियो समाधान

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16. A point object is placed at a distance of $20 c m$ from a thin plano-convex lens of focal length $15 c m$ . The plane surface of the lens is now silvered. The image created by the system is at