NEET Class neet Answered
? Explain it with proper sign convention..Thanks !
![question image](https://images.topperlearning.com/topper/new-ate/topr_18924401945452IMG20200825163737.jpeg)
Asked by jhajuhi19 | 25 Aug, 2020, 16:40: PM
The concave lens of focal length 20 cm when placed in contact with plane mirror.
The focal length of concave lens is 20 cm
Thus, fc = -20 cm
Focal length of plane mirror, fp = ∞
Focal length of that convex mirror is,
![1 over F space equals space 1 over f subscript C plus 1 over f subscript p plus 1 over f subscript C
space... space left parenthesis W h e n space t h e space l i g h t space r a y space f a l l s space o n space t h e space c o n c a v e space l e n s space i t space w i l l space t h e n space r e f r a c t space a n d space i n c i d e n t space o n space p l a n e space m i r r o r space a n d space a f t e r space r e f l e c t i n g space w i l l space
a g a i n space i n c i d e n t space o n space c o n c a v e space l e n s space a n d space t h e n space w i l l space d i v e r g e space o u t space f r o m space c o n c a v e space l e n s right parenthesis space
therefore 1 over F space equals space 2 over f subscript C plus 1 over f subscript p space equals space fraction numerator 2 over denominator negative 20 end fraction plus 1 over infinity space equals space fraction numerator 2 over denominator negative 20 end fraction plus 0 equals space fraction numerator 1 over denominator negative 10 end fraction
therefore F space equals space minus 10 space c m space](https://images.topperlearning.com/topper/tinymce/cache/968cb94f1694c7a3844819b0144a81c6.png)
As the focal length is negative the combination will act like concave mirror.
Thus,
correct option is (4) - Concave mirror of focal length 10 cm.
Answered by Shiwani Sawant | 26 Aug, 2020, 01:49: AM
NEET neet - Physics
Asked by kashinathpaikrao89446 | 09 Jul, 2024, 10:46: AM
NEET neet - Physics
Asked by jagadishshnkr | 08 Jul, 2024, 20:50: PM
NEET neet - Physics
Asked by hibasherinichu | 23 Dec, 2023, 07:02: AM
NEET neet - Physics
Asked by myindiaisbad | 06 Jul, 2022, 15:36: PM
NEET neet - Physics
Asked by neetaspirantdoctor | 14 May, 2022, 22:59: PM
NEET neet - Physics
Asked by humerachopda143 | 04 Aug, 2021, 20:22: PM
NEET neet - Physics
Asked by sirib942254 | 15 Jul, 2021, 17:32: PM
NEET neet - Physics
Asked by tasminmazumdar | 01 Jun, 2021, 00:48: AM