Chapter 1:Chemical Reaction And Equations
Chapter 2:Acids, Bases and Salts
Chapter 3:Metals and Non-metals
Chapter 4:Carbon and Its Compounds
Chapter 5: Periodic Classification of Elements
Chapter 10: Light Reflection and Refraction
Chapter 11:Human Eye and Colourful World
(a) Water
(b) Glass
(c) Plastic
(d) Clay
(d) Clay
(a) Between the principal focus and the centre of curvature
(b) At the centre of curvature
(c) Beyond the centre of curvature
(d) Between the pole of the mirror and its principal focus.
(d) Between the pole of the mirror and its principal focus.
(a) At the principal focus of the lens
(b) At twice the focal length
(c) At infinity
(d) Between the optical centre of the lens and its principal focus.
(b) Between the optical centre of the lens and its principal focus
(a) both concave
(b) both convex
(c) the mirror is concave and the lens is convex
(d) the mirror is convex, but the lens is concave
(a) Both concave.
(a) plane
(b) concave
(c) convex
(d) either plane or convex
(d) either plane or convex
(a) A convex lens of focal length 50 cm
(b) A concave lens of focal length 50 cm
(c) A convex lens of focal length 5 cm
(d) A concave lens of focal length 5 cm
(c) A convex lens of focal length 5 cm
As we know an erect image of an object, using a concave mirror form when we place object between focus and pole So range of the distance of the object must be between 0 to 15 cm from the pole of the mirror.
Nature of the image is virtual, erect, and larger than the object.
(a) Headlights of a car
(b) Side/rear-view mirror of a vehicle
(c) Solar furnace
Support your answer with reason.
(a) We use Concave Mirror for Headlights of a car to get powerful parallel beams of light.
(b) Convex mirrors are used rear-view (wing) mirrors in vehicles because it always give an erect image. Also, it have a wider field of view
(c) Concave Mirror: concave mirrors are used to concentrate sunlight to produce heat in solar furnaces..
Yes, from above figure we observe that the lens will produce a complete image even half of a convex lens is covered with a black paper. however the intensity of the image may be less.
Height of the Object, ho = 5 cm
object Distance u = -25 cm
Focal length f = 10 cm
We know lens formula,
So Image is inverted and formed at a distance of 16.7 cm behind the lens and measures 3.3 cm. The ray diagram is shown below.
Focal length f = – 15 cm
Image distance, v= – 10 cm
We know lens formula,
The negative value indicates that the object is placed in front of the lens
Focal length of convex mirror (f) = +15 cm
Object distance (u) = – 10 cm
we know mirror formula,
The image distance is 6 cm .
So image formed is virtual and erect and diminished.
The magnification is 1 means that the height of the image is equal to the height of the object and positive sign show image is virtual and erect
Object distance u = – 20 cm
Object height h = 5 cm
R = 30 cm
Also radius = 2 × Focal length
f = 15 cm
We know mirror formula,
So, the image formed is erect, virtual, and smaller in size.
Object distance u = – 27 cm
Object height h = 7 cm
Focal length f = – 18 cm
We know mirror formula
The image formed is inverted and larger than object.
Here P = -2D
-2 =A concave lens has a negative focal length. So it is a concave lens.
P = 1.5D
f =. it is a convex lens because a convex lens has a positive focal length.
Chapter 1:Chemical Reaction And Equations
Chapter 2:Acids, Bases and Salts
Chapter 3:Metals and Non-metals
Chapter 4:Carbon and Its Compounds
Chapter 5: Periodic Classification of Elements
Chapter 10: Light Reflection and Refraction
Chapter 11:Human Eye and Colourful World
Chapter 13:Magnetic Effects of Electric Current
Chapter 16:Sustainable Management of Natural Resources