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1.When current is switched ‘On’ in a room heater.it___________
2.Longer line in the symbol for a cell represents its___________terminal
3.A nimage that can’t be obtained on a screen is called___________.
4.Image formed by a convex_______is always virtual and smaller insize
5.a nimage formed by a concave_________can’t be obtained on asc

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1. When “current is switched” on in a “room heater” it produces heat due to “the heating effect” of the electric current.

2. Longer line in the symbol for a cell represents its positive terminal. 

3. An image that cannot be obtained on a screen is called virtual image.

4. Image formed by a convex lens is always virtual and smaller in size.

5. Images formed by a concave lens cannot be obtained on a screen as they are virtual.

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