An object is placed 10 cm in front of a mirror and an image is formed that is twice as large as the object. which of the following statements is false? the mirror must be concave. if the image is erect, the focal length of the mirror must be negative. if the image is erect, then the image distance is greater than the object distance. if the image is inverted, then the image distance is less than the object distance.

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

truck y has a greater velocity than truck x.

answer: the correct answer for the fill in the blank is rods.

rods are the specialized photoreceptor cells that are present in the retina of human eye. they are responsible for vision in the night time ( also called scotopic vision). they have very low visual acuity and color distinguishing ability.

as they are responsible for vision in night time, therefore they are found predominantly in the nocturnal animals.