Mohamed Esam ibrahim
نتيجة الإختبار - G9 U2 L2 GE
اسم الطالب : Mohamed Esam ibrahim
المدينة : كفر الشيخ
Friday , 15 November 2024 - 01:48 PM11 من 15
السؤال - 1
Lenses are used in all of the following except .......
cameras.
medical glasses.
binoculars.
solar ovens.
إجابة صحيحة
السؤال - 2
Concave lens is called .......... lens.
diverging
converging
collecting
reflecting
إجابة خاطئة
السؤال - 3
The convex lens ..........
is thin at the centre and more thickness at the tips.
is thick at the tips and less thickness at the centre.
is collectes the light rays falling on it.
is diverges the light rays falling on it.
إجابة صحيحة
السؤال - 4
If the focal length of a concave lens is 6 cm, the radius of curvature equals .......
3 cm.
6 cm.
9 cm.
12 cm.
إجابة صحيحة
السؤال - 5
If the radius of curvature of a lens is 40 cm, its focal length equals ..........
5 m.
10 cm.
20 cm.
50 cm.
إجابة خاطئة
السؤال - 6
If a light ray falls passing through the optical centre of the convex lens, it leaves the lens ..........
passing through the focus.
parallel to the principal axis.
without refraction. without reflection.
إجابة صحيحة
السؤال - 7
A convex lens its focal length 5 cm, if you put an object at a distance more than double the focal length, the formed image is real, inverted and smaller at a distance .......... cm.
3
5
8
10
إجابة خاطئة
السؤال - 8
The optical piece which forms virtual, upright and diminished image of the body is ....
convex mirror.
plane mirror.
convex lens.
concave mirror.
إجابة صحيحة
السؤال - 9
An object when it was placed at the focus of a convex lens, the image will be …
between the focus and the centre of curvature.
at the centre of curvature.
not formed.
at the optical centre.
إجابة صحيحة
السؤال - 10
On putting a lighted torch facing a convex lens at its focus, the light rays emerged from the lens are ......
parallel.
diverged.
converged.
dispersed.
إجابة صحيحة
السؤال - 11
A lens is placed in the passage of Sun rays, a very small image for the Sun is formed at a distance 20 cm from the optical centre of the lens, if this lens is used to form a real, inverted and enlarged image for another body. What is the distance between the body and the optical centre of the lens ? ..........
10 cm.
20 cm.
30 cm.
40 cm.
إجابة خاطئة
السؤال - 12
The real image is formed by the .........
plane mirror.
convex mirror.
concave lens.
convex lens.
إجابة صحيحة
السؤال - 13
Some of vision defects occur due to that, ........
The eye lens is too convex.
The eyeball is always spherical.
the optic nerve is completely healthy.
the retina is completely healthy.
إجابة صحيحة
السؤال - 14
In short-sightedness, ..........
The images of the near objects is formed behind the retina.
The eyeball diameter is large.
the eyeball diameter is small.
the convexity of the eye lens surface is small.
إجابة صحيحة
السؤال - 15
The long-sightedness leads to the collection of rays coming from the near object …………. the retina.
on
behind
in front of
below
إجابة صحيحة