Discussion
Consider the following statements :
(1) A concave mirror always forms a real image.
(2) A real image cannot be obtained on a screen.
(3) A concave lens always form a virtual image.
(4) White light is composed of seven colours.
Choose the correct answer from the options given below :
Answer: C
The correct statements are (3) and (4) only.
A concave lens is diverging, so whatever the position of the object it forms a virtual, erect and diminished image. White light is a mixture of seven colours, the VIBGYOR spectrum seen when it passes through a prism. Both statements are correct.
Statement 1 is wrong because a concave mirror forms a virtual, magnified image when the object is between the pole and the focus, as in a shaving mirror. Statement 2 is wrong because a real image is formed by rays that actually meet, so it can be caught on a screen.
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