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mirrorrs, concave convex. formula solution

tips to help you reduce
exposure to gadgets:
Set Screen Time Limits:
Use apps or built-in
features on your devices to
limit the amount of time
you spend on screens each
day.
Create Gadget-Free
Zones: Designate certain
areas of your home, like
the dining room or
bedroom, as gadget-free
zones to encourage more
face-to-face interactions.
Take Regular Breaks:
Follow the 20-20-20 rule:
every 20 minutes, take a
20-second break and look
at something 20 feet away
to reduce eye strain.
Engage in Offline
Activities: Spend time on
hobbies that don鈥檛 involve
screens, such as reading
physical books, exercising,
or cooking.
Establish a Digital Detox
Routine: Set aside specific
times each day or week to
completely unplug from all
digital devices.

1.a. Visible light - According to the National Cancer Institute, there is no experimental evidence showing
that normal levels of visible light are dangerous to humans.
2.b. Cancer - Overexposure to UV radiation may cause cancer.
3.d. no damaging effects - Exposure to normal levels of extremely low frequency (ELF) waves causes no
damaging effects.
4.a. True - Children, including fetuses, are in greater danger than adults from exposure to microwave
radiation.
5.a. X-ray - X-rays are not an example of non-ionizing radiation.
6.d. visible light - About half of the total energy the sun gives off is in the form of visible light.
7.d. cataracts - Overexposure to microwave radiation can cause cataracts.
8.a. Lasers - The narrow beam of light from lasers can concentrate effects on the retina, causing a blind
spot.
9.a. True - Exposure to ionizing radiation can cause cancer.
10.c. beta radiation - Beta radiation is more penetrating than alpha particles but less damaging to living
tissue and DNA.
11.d. gamma radiation - The strongest ionizing radiation is gamma radiation.
12.d. hazards - Any agent that can cause harm or damage to humans, property, or the environment is called
a hazard.
13.a. Alpha radiation - Alpha radiation occurs when an atom undergoes radioactive decay.

鈥mages Formed by Plane
Mirrors

Q1. Compare the distance from the
mirror of the object with that of the
image.
Q2. How does the height and width of
the object compare with that of the
image?

Note: If, you have an available plane mirror at home, an ordinary
laser light and a protractor, you may try doing the activity given below.
It would be an exciting learning experience. Simply follow the set-up
shown on the figure.
Caution: Be careful in handling the mirror and laser light. Never
focus the laser to your eyes or to anybody鈥檚 eyes as it may cause
damage to the eyes.
Q3. How does the angle of incidence compare with the
angle of reflection? Activity

Reflection is the bouncing of light rays when it hits a surface like a
plane mirror. Plane mirrors exhibits regular reflection where the
angle of incidence is equal to the angle of reflection. All plane shiny
surfaces exhibit this kind of reflection. Irregular or diffused reflection
illuminates shaded areas such as under the trees and inside
buildings. This is observed in objects with irregular surfaces such as
rocks, buildings etc.

The first law of reflection states that the angle of
incidence is equal to the angle of reflection. The angle
is measured between the normal line and the incident
ray while the angle of reflection is measured between
the normal line and the reflected ray. The arrowhead
shows the direction of light.

The second law states that the normal line, incident ray and
reflected ray all lie in the same plane. That means, what you
see on the mirror is an image which appears to be at the back
of the mirror.

The characteristics of images formed by plane mirrors is describe in
terms of type of image, orientation, location and size. For plane mirrors,
the type of image is virtual formed behind. Virtual image is an image
formed when an outgoing ray from an object always diverge (move
apart). The image you see when you are looking at yourself in a plane
mirror is virtual. This image is formed by extending the light rays behind
the mirror. The image orientation is erect, laterally inverted

The image is located at the same distance from the mirror as the object
distance. The image formed is of the same size as the object. In other
words, the image and the object in plane mirrors has the same
characteristics except that the image is seen as laterally inverted. Lateral
inversion is a phenomenon wherein what is left on the object appears as
right on the image and vice versa, This is due to the direction that light
follows when it strikes a reflecting surface generally like a mirror.

1. What is the image distance and image size if a 5.00 cm. tall light bulb placed a
distance of 45.5 cm. from a convex lens having a focal length of 15.4 cm ?
2. What is the image distance and image height if a 7.00 cm tall object is placed
30.0 cm from a concave mirror having a focal length of 10.0 cm?
3. What is the focal length of a convex mirror that produces an image that
appears 15.0 cm behind the mirror when the object is 27.5 cm from the mirror?

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mirrorrs, concave convex. formula solution

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mirrorrs, concave convex. formula solution