(Image distance)/(object distance) =(height of the image)/(height of the object)
(20/1000)= (4/x)
X=2m
joseph rimiru answered the question on October 31, 2017 at 21:04
- List two common application of plane mirrors (Solved)
List two common application of plane mirrors
Date posted: October 31, 2017. Answers (1)
- Define the term magnification(Solved)
Define the term magnification
Date posted: October 31, 2017. Answers (1)
- Define what is (a) Solar eclipse or eclipse of the moon (b) Annular eclipse of the sun (c) Lunar eclipse(Solved)
Define what is
a. Solar eclipse or eclipse of the moon
b. Annular eclipse of the sun
c. Lunar eclipse
Date posted: October 31, 2017. Answers (1)
- List four applications of convection in fluids.(Solved)
List four applications of convection in fluids.
Date posted: October 31, 2017. Answers (1)
- a. How does heat transfer take place in fluids? b. Explain the terms (i) natural convection(Solved)
a. How does heat transfer take place in fluids?
b. Explain the terms
i. Natural convection
ii. Forced convection
Date posted: October 31, 2017. Answers (1)
- Describe how the volume and density of water changes from 0°c to 10°c(Solved)
Describe how the volume and density of water changes from 0⁰c to 10⁰c
Date posted: October 31, 2017. Answers (1)
- List areas of application of expansion and contraction in solids(Solved)
List areas of application of expansion and contraction in solids
Date posted: October 31, 2017. Answers (1)
- Define the terms (i) Expansivity (ii) Linear expansion(Solved)
Define the terms
(i) Expansivity
(ii) Linear expansion
Date posted: October 31, 2017. Answers (1)
- When does the (a) Regular or specular reflection (b) Diffuse reflection take place?(Solved)
When does the
a. Regular or specular reflection
b. Diffuse reflection take place?
Date posted: October 30, 2017. Answers (1)
- State the factors that determine the type of shadow formed from an object.(Solved)
State the factors that determine the type of shadow formed from an object.
Date posted: October 30, 2017. Answers (1)
- What does rectilinear propagation of light mean?(Solved)
What does rectilinear propagation of light mean?
Date posted: October 30, 2017. Answers (1)
- State the formula for finding the number of images formed when mirrors are placed at an angle to each other(Solved)
State the formula for finding the number of images formed when mirrors are placed at an angle to each other.
Date posted: October 30, 2017. Answers (1)
- State the laws of reflection for all reflecting surfaces.(Solved)
State the laws of reflection for all reflecting surfaces.
Date posted: October 30, 2017. Answers (1)
- Define the following terms as used in reflection of light (a) Incident ray (b) Angle of incidence (c) Reflected ray (d) Normal ray (e) Angle of reflection(Solved)
Define the following terms as used in reflection of light.
a. Incident ray
b. Angle of incidence
c. Reflected ray
d. Normal ray
e. Angle of reflection
Date posted: October 30, 2017. Answers (1)
- Define the terms: (a)Opaque (b)Translucent (c) Opaque (d) Umbra (e) Penumbra(Solved)
Define the terms:
a. Opaque
b. Translucent
c. Opaque
d. Umbra
e. Penumbra
Date posted: October 30, 2017. Answers (1)
- Define the terms : (a) Luminous sources (b) Non luminous sources(Solved)
Define the terms :
a. Luminous sources
b. Non luminous sources
Date posted: October 30, 2017. Answers (1)
- Explain the following: (a) Two thin T-shirts are warmer than a single thick one (b) Hot flames go upwards (c) A chimney and a fire help to ventilate a room.(Solved)
Explain the following:
a. Two thin T-shirts are warmer than a single thick one
b. Hot flames go upwards
c. A chimney and a fire help to ventilate a room.
Date posted: October 30, 2017. Answers (1)
- What is thermal equilibrium?(Solved)
What is thermal equilibrium?
Date posted: October 30, 2017. Answers (1)
- (a) Define the terms heat and temperature of stating their SI units (b) How is heat measured?(Solved)
a. Define the terms heat and temperature of stating their SI units
b. How is heat measured?
Date posted: October 30, 2017. Answers (1)
- In designing a solar heater explain the following: (a) Why the pipe is fixed to a dark coloured collector plate (b) Why the pipe is made of copper(Solved)
In designing a solar heater explain the following:
a. Why the pipe is fixed to a dark coloured collector plate.
b. Why the pipe is made of copper
c. Why the pipe is coiled several times
d. Why the collector plate is fixed to an insulator
e. Why the panel front is made of glass.
Date posted: October 30, 2017. Answers (1)