Question

 If the focal length of a convex lens is 5cm and an object is placed at a distance of 10 cm from it, then its image will be formed at a distance of

5cm on the other side of the lens

10cm on the same side of the lens

10cm on the other side of the lens

None of the above​

Answer 1

Explanation:

 If the focal length of a convex lens is 5cm and an object is placed at a distance of 10 cm from it, then its image will be formed at a distance of

5cm on the other side of the lens

10cm on the same side of the lens

10cm on the other side of the lens

None of the above

Answer 2

Explanation:

 If the focal length of a convex lens is 5cm

1. point I would be center of curvature of the mirror.
2. So focal length of mirror f=
3. 2
4. MI
7. here For lens,
8. f
9. 1
11. =
12. v
13. 1
15. −
16. u
17. 1
20. v
21. 1
23. =
24. f
25. 1
27. +
28. u
29. 1
32. Here , f=+10cm,u=−15cm
33. v
34. 1
36. =
37. 10
38. 1
40. +
41. −15
42. 1
45. v=+30cm
46. MI=LI−LM
47. =30−10=20cm
48. f=
49. 2
50. MI
52. =
53. 2
54. 20
57. f=10cm

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