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  • Draw a ray diagram concave mirror which focus 20cm and radius of convecture is 40 cm then object is placed in  5 cm  20cm 25cm 30 cm 40cm 5

Draw a ray diagram concave mirror which focus 20cm and radius of convecture is 40 cm then object is placed in 

5 cm 

20cm

25cm

30 cm

40cm

50 cm

60cm

Each 5 cm is equals to 1 cm 

When object is in front of reflecting surface of concave mirror

Answers (1)

best_answer

\frac{1}{f}=\frac{1}{v}+\frac{1}{w}, \quad f=-20 cm

\begin{aligned} &\text { Object at } 5 cm \text { : }\\ &u=-5 \Rightarrow v=+6.67 cm \Rightarrow \text { Virtual, erect, enlarged } \end{aligned}

2. \(u =-20 \rightarrow v=\infty \rightarrow\) Image at infinity

3. \(u =-25 \rightarrow v=-100 \rightarrow\) Real, inverted, enlarged

4. \(u =-30 \rightarrow v=-60 \rightarrow\) Real, inverted

5. \(u =-40 \rightarrow v=-40 \rightarrow\) Real, same size

6. \(u =-50 \rightarrow v=-33.3 \rightarrow\) Real, diminished

7. \(u =-60 \rightarrow v=-30 \rightarrow\) Real, more diminished

Posted by

Divya Sharma

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