Light-Reflection and Refraction | Activities in Text Book with Solution

Activity 10.4

Draw neat ray diagrams for each position of the object shown in Table 10.1.

Table 10.1: Image formation by a concave mirror for different positions of the object

Position of the object	Position of the image	Size of the image	Nature of the image
(a) At infinity	At the focus F	Highly diminished, point-sized	Real & inverted
(b) Beyond C	b/w F & C	Diminished	Real & inverted
(c) At C	At C	Same size	Real & inverted
(d) b/w C & F	Beyond C	Enlarged	Real & inverted
(e) At F	At infinity	Highly enlarged	Real & inverted
(f) b/w P & F	Behind the mirror	Enlarged	Virtual & erect

You may take any two of the rays mentioned in the previous section for locating the image.

✅ Answer:

Compare your diagram with those given in Fig. 10.7.

✅ Answer: They are same.

Describe the nature, position and relative size of the image formed in each case.

Tabulate the results in a convenient format.

✅ Answer:

Position of the object	Position of the image	Size of the image	Nature of the image
At infinity	At the focus F	Highly diminished, point-sized	Real & inverted
Beyond C	b/w F & C	Diminished	Real & inverted
At C	At C	Same size	Real & inverted
b/w C & F	Beyond C	Enlarged	Real & inverted
At F	At infinity	Highly enlarged	Real & inverted
b/w P & F	Behind the mirror	Enlarged	Virtual & erect

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