Science
The radius of curvature of a converging mirror is 30 cm. At what distance from the mirror should an object be placed so as to obtain a virtual image?
- Infinity
- 30 cm
- Between 15 cm and 30 cm
- Between 0 cm and 15 cm
Related Questions
If a lens can converge the sun rays at a point 20 cm away from its optical centre, the power of this lens is –
- +2D
- –2D
- +5D
- –5D
Observe the diagram of an activity given below. What does it help to conclude, when the person exhales into the test-tube?
- Percentage of carbon dioxide is more in inhaled air.
- Fermentation occurs in the presence of oxygen.
- Percentage of carbon dioxide is more in exhaled air.
- Fermentation occurs in presence of carbon dioxide
Identify the two components of phloem tissue that help in transportation of food in plants.
- Phloem parenchyma & sieve tubes
- Sieve tubes & companion cells
- Phloem parenchyma & companion cells
- Phloem fibres and sieve tubes
The length of small intestine in a deer is more as compared to the length of small intestine of a tiger. The reason for this is :
- Mode of intake of food
- Type of food consumed
- Presence or absence of villi in intestine
- Presence or absence of digestive enzymes