Un objeto se encuentra a 60 cm de un espejo cóncavo de 40 cm de radio y
el objeto es 4 cm de alto.

Calcular el tamaño de la imagen:
A) 30 cm
B) 25 cm
C) 20 cm
D) 16 cm

Calcular la posición de la imagen:
A)-5cm
B)-3cm
C)-2cm
D)-1cm

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b.b. at twice the distance, the magnitude of the field is 2b.c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.