Science
01 Name any two effects of an electric current?
Q2 What is a virtual image? Give one situation where a virtual image is formed
Q3 Difference between convex and concave lens?
04 What do you understand by cyclones?
25 Difference between clay soil and sandy soil?
Answer:
The two effects of electric current are; heating effect and magnetic effect.
A virtual image is formed when reflected rays appear to meet. Such images cannot be obtained on screen. Plane mirrors, convex mirror and concave lens always forms virtual image.
A concave lens is thinner in the middle and thicker at the edges. A convex lens is thicker in the middle and thinner at the edges. Used in the camera, focus sunlight, overhead projector, projector microscope, simple telescope, magnifying glasses, etc.