Why are shaving mirrors concave?
1 Answer. Concave mirrors are used as shaving mirrors. This is because when the face is placed close to a concave mirror (so that the face is within its focus) the concave mirror produces a magnified and erect image of the face.
Which mirror is used in solar cooker?
Concave mirrors are used in solar cookers. This is because they are the only type of mirrors that reflect sunlight to a single focal point. If you use a convex mirror for your cooker, it will not work since they do not have a focal point.
Is used in Periscope?
Plane mirrors are used in a reflecting periscope.
Can you use foil instead of mirrors to make a periscope?
Start by making your own mirrors by using glue and placing aluminum foil on your index cards. Be careful! Make certain that the aluminum foil stays smooth and that you glue the shiny side up. Now take the shoe box and line it with black paper.
What’s a periscope?
A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer’s current position. In its simplest form, it consists of an outer case with mirrors at each end set parallel to each other at a 45° angle.
How easy is it to make a periscope at home?
Place a curved elbow joint pipe over each end of the pipe to make a periscope shape. Have the two openings point in opposite directions if you want to look around corners or over obstacles. Find two mirrors that fit the pipe. These mirrors must be small enough to insert each one into one end of the pipe.
How could you build your periscope to see behind you?
Any sized box works as long as you have big enough mirrors positioned at a 45° angle. Make a periscope with a really long tube. The longer the tube is, the smaller the image you will see. Note: Periscopes in tanks and submarines have magnifying lenses between the mirrors to make the reflected image bigger.
What is periscope physics?
A periscope is an optical instrument that uses a system of prisms, lenses or mirrors to reflect images through a tube. Light from a distant object strikes the top mirror and is then reflected at an angle of 90 degrees down the periscope tube.
Why is it called a periscope?
periscope (n.) viewing apparatus on a submarine, by which objects in a horizontal view may be seen through a vertical tube, 1899, formed in English from peri- “around” + -scope “instrument for viewing.” Earlier (1865) a technical term in photography.
What is a periscope Class 8?
A periscope is a long, tubular device through which a person can see objects that are out of the direct line of sight. The periscope makes use of two plane mirrors to see over the top of things. Principle. A periscope works on the reflection of light from two plane mirrors arranged parallel to one another.
How are periscopes used today?
Periscopes are still used today in tanks and some submarines. In the periscope, light hits the top mirror at 45° and reflects away at the same angle. The light then bounces down to the bottom mirror. When that reflected light hits the second mirror it is reflected again at 45°, right into your eye.